organic compounds
5-Fluoro-3-(3-fluorophenylsulfonyl)-2-methyl-1-benzofuran
aDepartment of Chemistry, Dongeui University, San 24 Kaya-dong, Busanjin-gu, Busan 614-714, Republic of Korea, and bDepartment of Chemistry, Pukyong National University, 599-1 Daeyeon 3-dong, Nam-gu, Busan 608-737, Republic of Korea
*Correspondence e-mail: uklee@pknu.ac.kr
In the title compound, C15H10F2O3S, the 3-fluorophenyl ring makes a dihedral angle of 79.51 (6)° with the mean plane [r.m.s. deviation = 0.006 (2) Å] of the benzofuran fragment. In the crystal, molecules are linked by weak C—H⋯F and C—H⋯O hydrogen bonds. The also exhibits slipped π–π interactions between the benzene and furan rings of neighbouring molecules [centroid–centroid distances = 3.563 (3) and 3.820 (3) Å and slippages of 0.358 (3)and 1.551 (3) Å]. In the 3-fluorophenyl ring, the F atom is disordered over two positions with site-occupancy factors of 0.887 (3) and 0.113 (3).
Related literature
For background information and the crystal structures of related compounds, see: Choi et al. (2010, 2012).
Experimental
Crystal data
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Refinement
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Data collection: APEX2 (Bruker, 2009); cell SAINT (Bruker, 2009); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 (Farrugia, 1997) and DIAMOND (Brandenburg, 1998); software used to prepare material for publication: SHELXL97.
Supporting information
https://doi.org/10.1107/S1600536812031972/pk2432sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536812031972/pk2432Isup2.hkl
Supporting information file. DOI: https://doi.org/10.1107/S1600536812031972/pk2432Isup3.cml
3-Chloroperoxybenzoic acid (77%, 515 mg, 2.3 mmol) was added in small portions to a stirred solution of 5-fluoro-3-(3-fluorophenylsulfanyl)-2-methyl-1-benzofuran (304 mg, 1.1 mmol) in dichloromethane (50 mL) at 273 K. After being stirred at room temperature for 10h, the mixture was washed with saturated sodium bicarbonate solution and the organic layer was separated, dried over magnesium sulfate, filtered and concentrated at reduced pressure. The residue was purified by
(benzene) to afford the title compound as a colorless solid [yield 73%, m.p. 443-444 K; Rf = 0.66 (benzene)]. Single crystals suitable for X-ray diffraction were prepared by slow evaporation of a solution of the title compound in ethyl acetate at room temperature.All H atoms were positioned geometrically and refined using a riding model, with C–H = 0.93 Å for aryl and 0.96 Å for methyl H atoms. Uiso(H) = 1.2Ueq(C) for aryl and 1.5Ueq(C) for methyl H atoms. The positions of methyl hydrogens were optimized rotationally. The F2 atom of the 3-fluorophenyl ring is disordered over two positions with site occupancy factors, from
of 0.887 (3) (part A) and 0.113 (3) (part B). The distance of equivalent C-F pairs were restrained to 1.330 (5) Å using the SHELXL-97 command DFIX, and displacement ellipsoids of F2 set were restrained using the SHELXL-97 command ISOR.As a part of our continuing study of 5-fluoro-2-methyl-1-benzofuran derivatives containing 3-(4-fluorophenylsulfonyl) (Choi et al., 2010) and 3-(4-methylphenylsulfonyl) (Choi et al., 2012) substituents, we report herein the
of the title compound.In the title molecule (Fig. 1), the benzofuran unit is essentially planar, with a mean deviation of 0.006 (2) Å from the least-squares plane defined by the nine constituent atoms. In the 3-fluorophenyl ring, the F atom is disordered over two positions with site-occupancy factors, from π–π interactions between the benzene and furan rings of neighbouring molecules, with Cg1···Cg2iii and Cg1···Cg2iv distances of 3.563 (3) Å & 3.820 (3) Å, and interplanar distances of 3.545 (3) Å & 3.491 (3) Å resulting in slippages of 0.358 (3) Å & 1.551 (3) Å (Cg1 and Cg2 are the centroids of the C2-C7 benzene ring and the C1/C2/C7/O1/C8 furan ring, respectively).
of 0.887 (3) (part A) and 0.113 (3) (part B). The dihedral angle between the 3-fluorophenyl ring and the mean plane of the benzofuran ring is 79.51 (6)°. In the (Fig. 2), molecules are connected by weak intermolecular C–H···F and C–H···O hydrogen bonds (Table 1). The crystal packing (Fig. 3) also exhibits slippedFor background information and the crystal structures of related compounds, see: Choi et al. (2010, 2012).
Data collection: APEX2 (Bruker, 2009); cell
SAINT (Bruker, 2009); data reduction: SAINT (Bruker, 2009); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 (Farrugia, 1997) and DIAMOND (Brandenburg, 1998); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008).C15H10F2O3S | F(000) = 632 |
Mr = 308.29 | Dx = 1.558 Mg m−3 |
Monoclinic, P21/n | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -P 2yn | Cell parameters from 3933 reflections |
a = 7.2772 (2) Å | θ = 2.2–28.2° |
b = 11.0972 (3) Å | µ = 0.28 mm−1 |
c = 16.5625 (5) Å | T = 296 K |
β = 100.698 (2)° | Block, colourless |
V = 1314.28 (6) Å3 | 0.30 × 0.22 × 0.20 mm |
Z = 4 |
Bruker SMART APEXII CCD diffractometer | 3275 independent reflections |
Radiation source: rotating anode | 2732 reflections with I > 2σ(I) |
Graphite multilayer monochromator | Rint = 0.032 |
Detector resolution: 10.0 pixels mm-1 | θmax = 28.3°, θmin = 2.2° |
φ and ω scans | h = −9→9 |
Absorption correction: multi-scan (SADABS; Bruker, 2009) | k = −14→14 |
Tmin = 0.663, Tmax = 0.746 | l = −22→22 |
12792 measured reflections |
Refinement on F2 | Secondary atom site location: difference Fourier map |
Least-squares matrix: full | Hydrogen site location: difference Fourier map |
R[F2 > 2σ(F2)] = 0.037 | H-atom parameters constrained |
wR(F2) = 0.104 | w = 1/[σ2(Fo2) + (0.0548P)2 + 0.3108P] where P = (Fo2 + 2Fc2)/3 |
S = 1.04 | (Δ/σ)max = 0.001 |
3275 reflections | Δρmax = 0.36 e Å−3 |
202 parameters | Δρmin = −0.31 e Å−3 |
14 restraints | Extinction correction: SHELXL97 (Sheldrick, 2008), Fc*=kFc[1+0.001xFc2λ3/sin(2θ)]-1/4 |
Primary atom site location: structure-invariant direct methods | Extinction coefficient: 0.0088 (14) |
C15H10F2O3S | V = 1314.28 (6) Å3 |
Mr = 308.29 | Z = 4 |
Monoclinic, P21/n | Mo Kα radiation |
a = 7.2772 (2) Å | µ = 0.28 mm−1 |
b = 11.0972 (3) Å | T = 296 K |
c = 16.5625 (5) Å | 0.30 × 0.22 × 0.20 mm |
β = 100.698 (2)° |
Bruker SMART APEXII CCD diffractometer | 3275 independent reflections |
Absorption correction: multi-scan (SADABS; Bruker, 2009) | 2732 reflections with I > 2σ(I) |
Tmin = 0.663, Tmax = 0.746 | Rint = 0.032 |
12792 measured reflections |
R[F2 > 2σ(F2)] = 0.037 | 14 restraints |
wR(F2) = 0.104 | H-atom parameters constrained |
S = 1.04 | Δρmax = 0.36 e Å−3 |
3275 reflections | Δρmin = −0.31 e Å−3 |
202 parameters |
Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds involving l.s. planes. |
Refinement. Refinement of F2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F2, conventional R-factors R are based on F, with F set to zero for negative F2. The threshold expression of F2 > 2sigma(F2) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F2 are statistically about twice as large as those based on F, and R- factors based on ALL data will be even larger. |
x | y | z | Uiso*/Ueq | Occ. (<1) | |
S1 | 0.21640 (5) | 0.63440 (3) | 0.70540 (2) | 0.03087 (13) | |
F1 | 0.25059 (17) | 0.17801 (10) | 0.54399 (7) | 0.0617 (3) | |
O1 | 0.25258 (16) | 0.65312 (11) | 0.47256 (7) | 0.0437 (3) | |
O2 | 0.13169 (15) | 0.52825 (10) | 0.73181 (7) | 0.0373 (3) | |
O3 | 0.13613 (15) | 0.75027 (10) | 0.71521 (7) | 0.0407 (3) | |
C1 | 0.2307 (2) | 0.61487 (14) | 0.60279 (9) | 0.0324 (3) | |
C2 | 0.24256 (19) | 0.49996 (14) | 0.56282 (9) | 0.0323 (3) | |
C3 | 0.2414 (2) | 0.37946 (15) | 0.58555 (10) | 0.0375 (4) | |
H3 | 0.2332 | 0.3559 | 0.6387 | 0.045* | |
C4 | 0.2532 (2) | 0.29710 (17) | 0.52459 (11) | 0.0437 (4) | |
C5 | 0.2648 (2) | 0.32726 (19) | 0.44430 (11) | 0.0491 (5) | |
H5 | 0.2715 | 0.2671 | 0.4059 | 0.059* | |
C6 | 0.2664 (2) | 0.44598 (18) | 0.42199 (10) | 0.0456 (4) | |
H6 | 0.2745 | 0.4688 | 0.3687 | 0.055* | |
C7 | 0.2553 (2) | 0.53018 (16) | 0.48228 (9) | 0.0369 (4) | |
C8 | 0.2376 (2) | 0.70287 (16) | 0.54652 (10) | 0.0391 (4) | |
C9 | 0.2333 (3) | 0.83607 (17) | 0.54796 (12) | 0.0547 (5) | |
H9A | 0.2265 | 0.8632 | 0.6024 | 0.082* | |
H9B | 0.1259 | 0.8644 | 0.5101 | 0.082* | |
H9C | 0.3449 | 0.8671 | 0.5324 | 0.082* | |
C10 | 0.4518 (2) | 0.63802 (13) | 0.75603 (9) | 0.0298 (3) | |
C11 | 0.5530 (2) | 0.74450 (14) | 0.75670 (10) | 0.0375 (3) | |
H11 | 0.4957 | 0.8143 | 0.7332 | 0.045* | |
C12 | 0.7390 (2) | 0.74468 (16) | 0.79277 (11) | 0.0420 (4) | 0.887 (3) |
H12 | 0.8083 | 0.8150 | 0.7925 | 0.050* | 0.887 (3) |
C12' | 0.7390 (2) | 0.74468 (16) | 0.79277 (11) | 0.0420 (4) | 0.11 |
F2' | 0.8472 (11) | 0.8379 (6) | 0.8099 (5) | 0.042 (3) | 0.113 (3) |
C13 | 0.8244 (2) | 0.64277 (16) | 0.82925 (10) | 0.0409 (4) | |
H13 | 0.9504 | 0.6434 | 0.8535 | 0.049* | |
C14 | 0.7198 (2) | 0.54100 (15) | 0.82885 (10) | 0.0402 (4) | 0.887 (3) |
F2 | 0.80371 (19) | 0.44337 (11) | 0.86633 (8) | 0.0619 (4) | 0.887 (3) |
C14' | 0.7198 (2) | 0.54100 (15) | 0.82885 (10) | 0.0402 (4) | 0.11 |
H14' | 0.7770 | 0.4726 | 0.8546 | 0.048* | 0.113 (3) |
C15 | 0.5338 (2) | 0.53388 (14) | 0.79236 (9) | 0.0354 (3) | |
H15 | 0.4666 | 0.4626 | 0.7921 | 0.042* |
U11 | U22 | U33 | U12 | U13 | U23 | |
S1 | 0.0314 (2) | 0.0312 (2) | 0.0326 (2) | 0.00158 (14) | 0.01275 (15) | −0.00048 (14) |
F1 | 0.0746 (8) | 0.0435 (6) | 0.0622 (7) | 0.0073 (6) | −0.0001 (6) | −0.0119 (5) |
O1 | 0.0432 (7) | 0.0576 (8) | 0.0303 (6) | −0.0037 (5) | 0.0070 (5) | 0.0065 (5) |
O2 | 0.0380 (6) | 0.0387 (6) | 0.0384 (6) | −0.0052 (5) | 0.0158 (5) | −0.0007 (5) |
O3 | 0.0392 (6) | 0.0379 (6) | 0.0478 (7) | 0.0076 (5) | 0.0157 (5) | −0.0022 (5) |
C1 | 0.0281 (7) | 0.0384 (8) | 0.0318 (7) | 0.0015 (6) | 0.0084 (6) | 0.0008 (6) |
C2 | 0.0227 (7) | 0.0446 (9) | 0.0293 (7) | 0.0015 (6) | 0.0044 (5) | −0.0022 (6) |
C3 | 0.0337 (8) | 0.0431 (9) | 0.0347 (8) | 0.0026 (6) | 0.0040 (6) | −0.0033 (6) |
C4 | 0.0373 (9) | 0.0446 (10) | 0.0459 (9) | 0.0041 (7) | −0.0007 (7) | −0.0090 (7) |
C5 | 0.0390 (9) | 0.0659 (13) | 0.0404 (9) | 0.0022 (8) | 0.0023 (7) | −0.0205 (9) |
C6 | 0.0346 (8) | 0.0720 (13) | 0.0296 (8) | −0.0023 (8) | 0.0046 (6) | −0.0066 (8) |
C7 | 0.0265 (7) | 0.0530 (10) | 0.0306 (7) | −0.0012 (6) | 0.0044 (6) | 0.0004 (7) |
C8 | 0.0342 (8) | 0.0475 (10) | 0.0360 (8) | 0.0008 (7) | 0.0072 (6) | 0.0050 (7) |
C9 | 0.0671 (13) | 0.0459 (11) | 0.0512 (11) | −0.0017 (9) | 0.0116 (9) | 0.0113 (8) |
C10 | 0.0329 (7) | 0.0301 (7) | 0.0287 (7) | 0.0007 (6) | 0.0117 (6) | −0.0034 (5) |
C11 | 0.0417 (8) | 0.0307 (8) | 0.0419 (8) | −0.0004 (6) | 0.0126 (7) | 0.0003 (6) |
C12 | 0.0406 (9) | 0.0416 (9) | 0.0457 (9) | −0.0081 (7) | 0.0131 (7) | −0.0085 (7) |
C12' | 0.0406 (9) | 0.0416 (9) | 0.0457 (9) | −0.0081 (7) | 0.0131 (7) | −0.0085 (7) |
F2' | 0.038 (4) | 0.041 (5) | 0.048 (5) | −0.014 (3) | 0.013 (3) | −0.005 (3) |
C13 | 0.0344 (8) | 0.0540 (10) | 0.0345 (8) | 0.0003 (7) | 0.0072 (6) | −0.0090 (7) |
C14 | 0.0445 (9) | 0.0409 (9) | 0.0348 (8) | 0.0089 (7) | 0.0065 (7) | 0.0014 (7) |
F2 | 0.0601 (8) | 0.0469 (8) | 0.0715 (9) | 0.0124 (6) | −0.0070 (7) | 0.0121 (6) |
C14' | 0.0445 (9) | 0.0409 (9) | 0.0348 (8) | 0.0089 (7) | 0.0065 (7) | 0.0014 (7) |
C15 | 0.0416 (8) | 0.0303 (8) | 0.0355 (8) | −0.0009 (6) | 0.0103 (6) | −0.0006 (6) |
S1—O3 | 1.4339 (11) | C6—H6 | 0.9300 |
S1—O2 | 1.4349 (11) | C8—C9 | 1.479 (2) |
S1—C1 | 1.7354 (15) | C9—H9A | 0.9600 |
S1—C10 | 1.7627 (16) | C9—H9B | 0.9600 |
F1—C4 | 1.361 (2) | C9—H9C | 0.9600 |
O1—C8 | 1.366 (2) | C10—C15 | 1.386 (2) |
O1—C7 | 1.374 (2) | C10—C11 | 1.391 (2) |
C1—C8 | 1.357 (2) | C11—C12 | 1.374 (2) |
C1—C2 | 1.447 (2) | C11—H11 | 0.9300 |
C2—C3 | 1.390 (2) | C12—C13 | 1.375 (2) |
C2—C7 | 1.395 (2) | C12—H12 | 0.9300 |
C3—C4 | 1.376 (2) | C13—C14 | 1.361 (2) |
C3—H3 | 0.9300 | C13—H13 | 0.9300 |
C4—C5 | 1.389 (3) | C14—F2 | 1.3383 (19) |
C5—C6 | 1.369 (3) | C14—C15 | 1.378 (2) |
C5—H5 | 0.9300 | C15—H15 | 0.9300 |
C6—C7 | 1.381 (2) | ||
O3—S1—O2 | 119.64 (7) | C1—C8—O1 | 110.14 (15) |
O3—S1—C1 | 108.82 (7) | C1—C8—C9 | 134.79 (16) |
O2—S1—C1 | 107.65 (7) | O1—C8—C9 | 115.07 (15) |
O3—S1—C10 | 107.83 (7) | C8—C9—H9A | 109.5 |
O2—S1—C10 | 107.96 (7) | C8—C9—H9B | 109.5 |
C1—S1—C10 | 103.84 (7) | H9A—C9—H9B | 109.5 |
C8—O1—C7 | 107.34 (12) | C8—C9—H9C | 109.5 |
C8—C1—C2 | 107.87 (13) | H9A—C9—H9C | 109.5 |
C8—C1—S1 | 126.82 (13) | H9B—C9—H9C | 109.5 |
C2—C1—S1 | 125.29 (11) | C15—C10—C11 | 121.37 (15) |
C3—C2—C7 | 119.67 (15) | C15—C10—S1 | 119.32 (12) |
C3—C2—C1 | 136.08 (14) | C11—C10—S1 | 119.29 (12) |
C7—C2—C1 | 104.24 (14) | C12—C11—C10 | 118.79 (15) |
C4—C3—C2 | 115.85 (15) | C12—C11—H11 | 120.6 |
C4—C3—H3 | 122.1 | C10—C11—H11 | 120.6 |
C2—C3—H3 | 122.1 | C11—C12—C13 | 121.22 (16) |
F1—C4—C3 | 117.79 (16) | C11—C12—H12 | 119.4 |
F1—C4—C5 | 117.77 (16) | C13—C12—H12 | 119.4 |
C3—C4—C5 | 124.43 (18) | C14—C13—C12 | 118.25 (16) |
C6—C5—C4 | 119.70 (16) | C14—C13—H13 | 120.9 |
C6—C5—H5 | 120.2 | C12—C13—H13 | 120.9 |
C4—C5—H5 | 120.2 | F2—C14—C13 | 117.58 (16) |
C5—C6—C7 | 116.84 (16) | F2—C14—C15 | 118.89 (16) |
C5—C6—H6 | 121.6 | C13—C14—C15 | 123.53 (15) |
C7—C6—H6 | 121.6 | C14—C15—C10 | 116.82 (15) |
O1—C7—C6 | 126.08 (15) | C14—C15—H15 | 121.6 |
O1—C7—C2 | 110.41 (14) | C10—C15—H15 | 121.6 |
C6—C7—C2 | 123.51 (17) |
D—H···A | D—H | H···A | D···A | D—H···A |
C5—H5···F2i | 0.93 | 2.45 | 3.302 (2) | 153 |
C15—H15···O3ii | 0.93 | 2.47 | 3.3754 (19) | 165 |
Symmetry codes: (i) x−1/2, −y+1/2, z−1/2; (ii) −x+1/2, y−1/2, −z+3/2. |
Experimental details
Crystal data | |
Chemical formula | C15H10F2O3S |
Mr | 308.29 |
Crystal system, space group | Monoclinic, P21/n |
Temperature (K) | 296 |
a, b, c (Å) | 7.2772 (2), 11.0972 (3), 16.5625 (5) |
β (°) | 100.698 (2) |
V (Å3) | 1314.28 (6) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 0.28 |
Crystal size (mm) | 0.30 × 0.22 × 0.20 |
Data collection | |
Diffractometer | Bruker SMART APEXII CCD |
Absorption correction | Multi-scan (SADABS; Bruker, 2009) |
Tmin, Tmax | 0.663, 0.746 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 12792, 3275, 2732 |
Rint | 0.032 |
(sin θ/λ)max (Å−1) | 0.667 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.037, 0.104, 1.04 |
No. of reflections | 3275 |
No. of parameters | 202 |
No. of restraints | 14 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.36, −0.31 |
Computer programs: APEX2 (Bruker, 2009), SAINT (Bruker, 2009), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), ORTEP-3 (Farrugia, 1997) and DIAMOND (Brandenburg, 1998).
D—H···A | D—H | H···A | D···A | D—H···A |
C5—H5···F2i | 0.93 | 2.45 | 3.302 (2) | 152.6 |
C15—H15···O3ii | 0.93 | 2.47 | 3.3754 (19) | 165.2 |
Symmetry codes: (i) x−1/2, −y+1/2, z−1/2; (ii) −x+1/2, y−1/2, −z+3/2. |
Acknowledgements
This work was supported by the Blue-Bio Industry Regional Innovation Center (RIC08-06-07) at Dongeui University as an RIC program under the Ministry of Knowledge Economy and Busan city.
References
Brandenburg, K. (1998). DIAMOND. Crystal Impact GbR, Bonn, Germany. Google Scholar
Bruker (2009). APEX2, SADABS and SAINT. Bruker AXS Inc., Madison, Wisconsin, USA. Google Scholar
Choi, H. D., Seo, P. J. & Lee, U. (2012). Acta Cryst. E68, o455. Web of Science CSD CrossRef IUCr Journals Google Scholar
Choi, H. D., Seo, P. J., Son, B. W. & Lee, U. (2010). Acta Cryst. E66, o1909. Web of Science CSD CrossRef IUCr Journals Google Scholar
Farrugia, L. J. (1997). J. Appl. Cryst. 30, 565. CrossRef IUCr Journals Google Scholar
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As a part of our continuing study of 5-fluoro-2-methyl-1-benzofuran derivatives containing 3-(4-fluorophenylsulfonyl) (Choi et al., 2010) and 3-(4-methylphenylsulfonyl) (Choi et al., 2012) substituents, we report herein the crystal structure of the title compound.
In the title molecule (Fig. 1), the benzofuran unit is essentially planar, with a mean deviation of 0.006 (2) Å from the least-squares plane defined by the nine constituent atoms. In the 3-fluorophenyl ring, the F atom is disordered over two positions with site-occupancy factors, from refinement of 0.887 (3) (part A) and 0.113 (3) (part B). The dihedral angle between the 3-fluorophenyl ring and the mean plane of the benzofuran ring is 79.51 (6)°. In the crystal structure (Fig. 2), molecules are connected by weak intermolecular C–H···F and C–H···O hydrogen bonds (Table 1). The crystal packing (Fig. 3) also exhibits slipped π–π interactions between the benzene and furan rings of neighbouring molecules, with Cg1···Cg2iii and Cg1···Cg2iv distances of 3.563 (3) Å & 3.820 (3) Å, and interplanar distances of 3.545 (3) Å & 3.491 (3) Å resulting in slippages of 0.358 (3) Å & 1.551 (3) Å (Cg1 and Cg2 are the centroids of the C2-C7 benzene ring and the C1/C2/C7/O1/C8 furan ring, respectively).