organic compounds
3-(3-Chlorobenzoyl)-4-hydroxy-2H-1,2-benzothiazine 1,1-dioxide
aInstitute of Chemistry, University of the Punjab, Lahore 54590, Pakistan, bApplied Chemistry Research Centre, PCSIR Laboratories Complex, Lahore 54600, Pakistan, and cDepartment of Chemistry, The University of Calgary, 2500 University Drive NW, Calgary, Alberta, Canada T2N 1N4
*Correspondence e-mail: drhamidlatif@yahoo.com
In the title compound, C15H10ClNO4S, the heterocyclic thiazine ring adopts a half-chair conformation with the S and N atoms displaced by 0.476 (5) and 0.227 (5) Å, respectively, on opposite sides of the mean plane formed by the remaining ring atoms. The structure is stabilized by intermolecular N—H⋯O and C—H⋯O hydrogen bonds. In addition, intramolecular O—H⋯O and C—H⋯N interactions are also present.
Related literature
For the biological activity of 1,2-benzothiazine derivatives, see: Ahmad et al. (2010); Lombardino & Wiseman, (1972); Gupta et al. (1993, 2002); Zia-ur-Rehman et al. (2006); Berryman et al. (1998). For comparative bond distances, see: Allen et al. (1987). For related structures, see: Siddiqui et al. (2008)
Experimental
Crystal data
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Refinement
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Data collection: COLLECT (Hooft, 1998); cell DENZO (Otwinowski & Minor, 1997); data reduction: SCALEPACK (Otwinowski & Minor, 1997); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 for Windows (Farrugia, 1997); software used to prepare material for publication: SHELXL97.
Supporting information
10.1107/S1600536810009761/pk2231sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: 10.1107/S1600536810009761/pk2231Isup2.hkl
Sodium metal (4.83 g, 210 mmol) was dissolved in dry methanol (35 ml) and 2-[2-(3-chlorophenyl)-2-oxoethyl]-1,2-benzisothiazol-3(2H)-one 1,1-dioxide (10.07 g, 30 mmol) was added to it. The mixture was refluxed for 30 minutes. The contents of the flask were cooled to room temperature and pH was adjusted at 3.0 using 5% HCl. A pale yellow precipitate of the title compound was filtered and washed with cold methanol. Crystals suitable for crystallographic study were grown from a methanolic solution by slow evaporation at room temperature. Yield, 74%; m.p. 438-440 K.
Though all the H atoms could be distinguished in the difference Fourier map, they were included at geometrically idealized positions and refined using a riding-model approximation with the following constraints: O—H, N—H and C—H distances were set to 0.82, 0.86 and 0.93 Å, respectively, and Uiso(H) = 1.2Ueq(parent atom). The final difference map was essentially featureless.
Data collection: COLLECT (Hooft, 1998); cell
DENZO (Otwinowski & Minor, 1997); data reduction: SCALEPACK (Otwinowski & Minor, 1997); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 for Windows (Farrugia, 1997); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008).Fig. 1. The title molecule with the displacement ellipsoids plotted at 30% probability level (Farrugia, 1997). |
C15H10ClNO4S | Z = 2 |
Mr = 335.75 | F(000) = 344 |
Triclinic, P1 | Dx = 1.558 Mg m−3 |
Hall symbol: -P 1 | Mo Kα radiation, λ = 0.71073 Å |
a = 4.7151 (3) Å | Cell parameters from 1649 reflections |
b = 12.2879 (8) Å | θ = 1.0–27.5° |
c = 12.5809 (6) Å | µ = 0.43 mm−1 |
α = 81.375 (3)° | T = 295 K |
β = 84.463 (3)° | Block, yellow |
γ = 85.608 (3)° | 0.14 × 0.12 × 0.10 mm |
V = 715.88 (7) Å3 |
Nonius KappaCCD diffractometer | 3202 independent reflections |
Radiation source: fine-focus sealed tube | 2783 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.027 |
ω and ϕ scans | θmax = 27.5°, θmin = 1.6° |
Absorption correction: multi-scan (SORTAV; Blessing, 1997) | h = −6→6 |
Tmin = 0.942, Tmax = 0.958 | k = −15→15 |
4352 measured reflections | l = −16→16 |
Refinement on F2 | Primary atom site location: structure-invariant direct methods |
Least-squares matrix: full | Secondary atom site location: difference Fourier map |
R[F2 > 2σ(F2)] = 0.051 | Hydrogen site location: difference Fourier map |
wR(F2) = 0.121 | H-atom parameters constrained |
S = 1.09 | w = 1/[σ2(Fo2) + (0.025P)2 + 0.745P] where P = (Fo2 + 2Fc2)/3 |
3202 reflections | (Δ/σ)max < 0.001 |
200 parameters | Δρmax = 0.45 e Å−3 |
0 restraints | Δρmin = −0.36 e Å−3 |
C15H10ClNO4S | γ = 85.608 (3)° |
Mr = 335.75 | V = 715.88 (7) Å3 |
Triclinic, P1 | Z = 2 |
a = 4.7151 (3) Å | Mo Kα radiation |
b = 12.2879 (8) Å | µ = 0.43 mm−1 |
c = 12.5809 (6) Å | T = 295 K |
α = 81.375 (3)° | 0.14 × 0.12 × 0.10 mm |
β = 84.463 (3)° |
Nonius KappaCCD diffractometer | 3202 independent reflections |
Absorption correction: multi-scan (SORTAV; Blessing, 1997) | 2783 reflections with I > 2σ(I) |
Tmin = 0.942, Tmax = 0.958 | Rint = 0.027 |
4352 measured reflections |
R[F2 > 2σ(F2)] = 0.051 | 0 restraints |
wR(F2) = 0.121 | H-atom parameters constrained |
S = 1.09 | Δρmax = 0.45 e Å−3 |
3202 reflections | Δρmin = −0.36 e Å−3 |
200 parameters |
Experimental. IR (KBr) 3157, 1615, 1358, 1156 cm-1, MS m/z: 335.2 [M+]. 1H NMR (DMSO-d6); 7.64 (t, 2H, J = 8.0 Hz, Ar—H), 7.75 (d, 2H, J = 8.0 Hz, Ar—H), 7.96 (d, 1H, J = 10.0 Hz, Ar—H), 7.96 (s, 1H, J = 16.4 Hz, Ar—H), 8.18 (t, 2H, J = 3.2 Hz, Ar—H). |
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 > σ(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 | ||
Cl1 | 1.12832 (17) | −0.15369 (6) | 0.14547 (7) | 0.0618 (2) | |
S1 | −0.00971 (13) | 0.31098 (5) | 0.38523 (5) | 0.03988 (17) | |
O1 | 0.1096 (5) | 0.34309 (18) | 0.47468 (16) | 0.0601 (6) | |
O2 | −0.2260 (4) | 0.23281 (16) | 0.40650 (15) | 0.0511 (5) | |
O3 | −0.0663 (5) | 0.30935 (17) | 0.04835 (15) | 0.0604 (6) | |
H3O | 0.0372 | 0.2596 | 0.0257 | 0.073* | |
O4 | 0.3079 (4) | 0.15059 (17) | 0.05644 (14) | 0.0553 (5) | |
N1 | 0.2456 (4) | 0.26558 (18) | 0.30655 (17) | 0.0441 (5) | |
H1N | 0.4144 | 0.2519 | 0.3277 | 0.053* | |
C1 | −0.1507 (5) | 0.4240 (2) | 0.3008 (2) | 0.0415 (5) | |
C2 | −0.2846 (7) | 0.5148 (2) | 0.3434 (3) | 0.0563 (7) | |
H2 | −0.2815 | 0.5204 | 0.4162 | 0.068* | |
C3 | −0.4223 (8) | 0.5961 (3) | 0.2754 (3) | 0.0715 (10) | |
H3 | −0.5125 | 0.6575 | 0.3025 | 0.086* | |
C4 | −0.4271 (9) | 0.5873 (3) | 0.1678 (3) | 0.0748 (10) | |
H4 | −0.5241 | 0.6421 | 0.1233 | 0.090* | |
C5 | −0.2904 (7) | 0.4985 (3) | 0.1253 (3) | 0.0623 (8) | |
H5 | −0.2926 | 0.4943 | 0.0522 | 0.075* | |
C6 | −0.1488 (5) | 0.4148 (2) | 0.1915 (2) | 0.0425 (5) | |
C7 | −0.0006 (5) | 0.3206 (2) | 0.1462 (2) | 0.0415 (5) | |
C8 | 0.1900 (5) | 0.2482 (2) | 0.20148 (19) | 0.0386 (5) | |
C9 | 0.3263 (5) | 0.1547 (2) | 0.1542 (2) | 0.0407 (5) | |
C10 | 0.4876 (5) | 0.0619 (2) | 0.21729 (19) | 0.0394 (5) | |
C11 | 0.7101 (5) | 0.0062 (2) | 0.1617 (2) | 0.0413 (5) | |
H11 | 0.7634 | 0.0309 | 0.0895 | 0.050* | |
C12 | 0.8495 (5) | −0.0854 (2) | 0.2149 (2) | 0.0435 (6) | |
C13 | 0.7712 (7) | −0.1251 (2) | 0.3214 (2) | 0.0553 (7) | |
H13 | 0.8680 | −0.1870 | 0.3562 | 0.066* | |
C14 | 0.5477 (7) | −0.0714 (2) | 0.3752 (2) | 0.0589 (8) | |
H14 | 0.4910 | −0.0984 | 0.4465 | 0.071* | |
C15 | 0.4057 (6) | 0.0222 (2) | 0.3248 (2) | 0.0494 (6) | |
H15 | 0.2568 | 0.0583 | 0.3623 | 0.059* |
U11 | U22 | U33 | U12 | U13 | U23 | |
Cl1 | 0.0599 (4) | 0.0588 (4) | 0.0699 (5) | 0.0225 (3) | −0.0186 (4) | −0.0246 (4) |
S1 | 0.0367 (3) | 0.0471 (3) | 0.0379 (3) | 0.0050 (2) | −0.0090 (2) | −0.0131 (2) |
O1 | 0.0647 (13) | 0.0721 (14) | 0.0503 (11) | 0.0158 (10) | −0.0234 (10) | −0.0297 (10) |
O2 | 0.0417 (10) | 0.0556 (11) | 0.0526 (11) | −0.0028 (8) | −0.0053 (8) | 0.0035 (9) |
O3 | 0.0839 (15) | 0.0576 (13) | 0.0399 (10) | 0.0222 (11) | −0.0180 (10) | −0.0126 (9) |
O4 | 0.0659 (13) | 0.0607 (12) | 0.0395 (10) | 0.0191 (10) | −0.0104 (9) | −0.0160 (8) |
N1 | 0.0318 (10) | 0.0567 (13) | 0.0484 (12) | 0.0085 (9) | −0.0125 (9) | −0.0226 (10) |
C1 | 0.0394 (13) | 0.0387 (12) | 0.0480 (14) | 0.0002 (10) | −0.0061 (10) | −0.0116 (10) |
C2 | 0.0612 (18) | 0.0490 (16) | 0.0619 (17) | 0.0089 (13) | −0.0079 (14) | −0.0232 (13) |
C3 | 0.084 (2) | 0.0411 (16) | 0.089 (3) | 0.0195 (15) | −0.0117 (19) | −0.0194 (15) |
C4 | 0.095 (3) | 0.0494 (18) | 0.075 (2) | 0.0278 (17) | −0.0176 (19) | −0.0025 (15) |
C5 | 0.078 (2) | 0.0501 (17) | 0.0551 (17) | 0.0170 (15) | −0.0116 (15) | −0.0028 (13) |
C6 | 0.0442 (13) | 0.0365 (12) | 0.0466 (14) | 0.0033 (10) | −0.0058 (11) | −0.0067 (10) |
C7 | 0.0455 (13) | 0.0409 (13) | 0.0389 (12) | 0.0028 (10) | −0.0068 (10) | −0.0092 (10) |
C8 | 0.0358 (12) | 0.0424 (13) | 0.0390 (12) | 0.0015 (10) | −0.0045 (9) | −0.0118 (10) |
C9 | 0.0389 (12) | 0.0435 (13) | 0.0409 (13) | 0.0001 (10) | −0.0036 (10) | −0.0109 (10) |
C10 | 0.0428 (13) | 0.0381 (12) | 0.0385 (12) | −0.0001 (10) | −0.0051 (10) | −0.0094 (9) |
C11 | 0.0445 (13) | 0.0420 (13) | 0.0387 (12) | 0.0008 (10) | −0.0066 (10) | −0.0099 (10) |
C12 | 0.0437 (13) | 0.0426 (13) | 0.0476 (14) | 0.0028 (10) | −0.0130 (11) | −0.0140 (11) |
C13 | 0.073 (2) | 0.0411 (14) | 0.0527 (16) | 0.0030 (13) | −0.0202 (14) | −0.0049 (12) |
C14 | 0.082 (2) | 0.0514 (16) | 0.0420 (15) | −0.0081 (15) | −0.0055 (14) | −0.0009 (12) |
C15 | 0.0567 (16) | 0.0492 (15) | 0.0428 (14) | −0.0057 (12) | 0.0035 (12) | −0.0122 (11) |
Cl1—C12 | 1.739 (3) | C4—H4 | 0.9300 |
S1—O1 | 1.4240 (18) | C5—C6 | 1.394 (4) |
S1—O2 | 1.434 (2) | C5—H5 | 0.9300 |
S1—N1 | 1.604 (2) | C6—C7 | 1.467 (3) |
S1—C1 | 1.747 (3) | C7—C8 | 1.377 (3) |
O3—C7 | 1.327 (3) | C8—C9 | 1.451 (3) |
O3—H3O | 0.8200 | C9—C10 | 1.491 (3) |
O4—C9 | 1.250 (3) | C10—C15 | 1.395 (4) |
N1—C8 | 1.422 (3) | C10—C11 | 1.396 (3) |
N1—H1N | 0.8600 | C11—C12 | 1.376 (3) |
C1—C2 | 1.391 (4) | C11—H11 | 0.9300 |
C1—C6 | 1.396 (3) | C12—C13 | 1.380 (4) |
C2—C3 | 1.380 (4) | C13—C14 | 1.376 (4) |
C2—H2 | 0.9300 | C13—H13 | 0.9300 |
C3—C4 | 1.377 (5) | C14—C15 | 1.385 (4) |
C3—H3 | 0.9300 | C14—H14 | 0.9300 |
C4—C5 | 1.376 (4) | C15—H15 | 0.9300 |
O1—S1—O2 | 118.25 (13) | O3—C7—C8 | 122.4 (2) |
O1—S1—N1 | 108.39 (12) | O3—C7—C6 | 115.1 (2) |
O2—S1—N1 | 109.12 (12) | C8—C7—C6 | 122.6 (2) |
O1—S1—C1 | 112.18 (12) | C7—C8—N1 | 118.7 (2) |
O2—S1—C1 | 106.33 (11) | C7—C8—C9 | 120.5 (2) |
N1—S1—C1 | 101.20 (12) | N1—C8—C9 | 120.8 (2) |
C7—O3—H3O | 109.5 | O4—C9—C8 | 119.2 (2) |
C8—N1—S1 | 119.34 (16) | O4—C9—C10 | 117.9 (2) |
C8—N1—H1N | 120.3 | C8—C9—C10 | 122.9 (2) |
S1—N1—H1N | 120.3 | C15—C10—C11 | 119.6 (2) |
C2—C1—C6 | 121.6 (2) | C15—C10—C9 | 122.6 (2) |
C2—C1—S1 | 120.7 (2) | C11—C10—C9 | 117.4 (2) |
C6—C1—S1 | 117.43 (18) | C12—C11—C10 | 119.3 (2) |
C3—C2—C1 | 118.6 (3) | C12—C11—H11 | 120.4 |
C3—C2—H2 | 120.7 | C10—C11—H11 | 120.4 |
C1—C2—H2 | 120.7 | C11—C12—C13 | 121.6 (2) |
C4—C3—C2 | 120.6 (3) | C11—C12—Cl1 | 119.0 (2) |
C4—C3—H3 | 119.7 | C13—C12—Cl1 | 119.3 (2) |
C2—C3—H3 | 119.7 | C14—C13—C12 | 118.9 (3) |
C5—C4—C3 | 120.9 (3) | C14—C13—H13 | 120.5 |
C5—C4—H4 | 119.6 | C12—C13—H13 | 120.5 |
C3—C4—H4 | 119.6 | C13—C14—C15 | 121.0 (3) |
C4—C5—C6 | 120.2 (3) | C13—C14—H14 | 119.5 |
C4—C5—H5 | 119.9 | C15—C14—H14 | 119.5 |
C6—C5—H5 | 119.9 | C14—C15—C10 | 119.6 (3) |
C5—C6—C1 | 118.2 (2) | C14—C15—H15 | 120.2 |
C5—C6—C7 | 120.3 (2) | C10—C15—H15 | 120.2 |
C1—C6—C7 | 121.5 (2) | ||
O1—S1—N1—C8 | −167.9 (2) | O3—C7—C8—N1 | −179.3 (2) |
O2—S1—N1—C8 | 62.0 (2) | C6—C7—C8—N1 | −0.1 (4) |
C1—S1—N1—C8 | −49.8 (2) | O3—C7—C8—C9 | −0.6 (4) |
O1—S1—C1—C2 | −35.9 (3) | C6—C7—C8—C9 | 178.6 (2) |
O2—S1—C1—C2 | 94.9 (2) | S1—N1—C8—C7 | 36.5 (3) |
N1—S1—C1—C2 | −151.2 (2) | S1—N1—C8—C9 | −142.2 (2) |
O1—S1—C1—C6 | 150.4 (2) | C7—C8—C9—O4 | 12.1 (4) |
O2—S1—C1—C6 | −78.9 (2) | N1—C8—C9—O4 | −169.2 (2) |
N1—S1—C1—C6 | 35.0 (2) | C7—C8—C9—C10 | −167.5 (2) |
C6—C1—C2—C3 | 1.1 (5) | N1—C8—C9—C10 | 11.2 (4) |
S1—C1—C2—C3 | −172.4 (3) | O4—C9—C10—C15 | −143.7 (3) |
C1—C2—C3—C4 | 0.2 (5) | C8—C9—C10—C15 | 35.9 (4) |
C2—C3—C4—C5 | −1.3 (6) | O4—C9—C10—C11 | 29.3 (3) |
C3—C4—C5—C6 | 1.2 (6) | C8—C9—C10—C11 | −151.1 (2) |
C4—C5—C6—C1 | 0.1 (5) | C15—C10—C11—C12 | −1.6 (4) |
C4—C5—C6—C7 | −179.4 (3) | C9—C10—C11—C12 | −174.8 (2) |
C2—C1—C6—C5 | −1.2 (4) | C10—C11—C12—C13 | 1.3 (4) |
S1—C1—C6—C5 | 172.5 (2) | C10—C11—C12—Cl1 | −179.47 (18) |
C2—C1—C6—C7 | 178.3 (3) | C11—C12—C13—C14 | 0.2 (4) |
S1—C1—C6—C7 | −8.0 (3) | Cl1—C12—C13—C14 | −179.1 (2) |
C5—C6—C7—O3 | −14.6 (4) | C12—C13—C14—C15 | −1.3 (5) |
C1—C6—C7—O3 | 165.9 (2) | C13—C14—C15—C10 | 0.9 (4) |
C5—C6—C7—C8 | 166.2 (3) | C11—C10—C15—C14 | 0.5 (4) |
C1—C6—C7—C8 | −13.3 (4) | C9—C10—C15—C14 | 173.4 (3) |
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1N···O2i | 0.86 | 2.03 | 2.872 (3) | 168 |
O3—H3O···O4 | 0.82 | 1.80 | 2.525 (3) | 146 |
C2—H2···O1ii | 0.93 | 2.54 | 3.279 (3) | 136 |
C14—H14···O2iii | 0.93 | 2.58 | 3.435 (3) | 153 |
C15—H15···N1 | 0.93 | 2.54 | 3.009 (4) | 112 |
Symmetry codes: (i) x+1, y, z; (ii) −x, −y+1, −z+1; (iii) −x, −y, −z+1. |
Experimental details
Crystal data | |
Chemical formula | C15H10ClNO4S |
Mr | 335.75 |
Crystal system, space group | Triclinic, P1 |
Temperature (K) | 295 |
a, b, c (Å) | 4.7151 (3), 12.2879 (8), 12.5809 (6) |
α, β, γ (°) | 81.375 (3), 84.463 (3), 85.608 (3) |
V (Å3) | 715.88 (7) |
Z | 2 |
Radiation type | Mo Kα |
µ (mm−1) | 0.43 |
Crystal size (mm) | 0.14 × 0.12 × 0.10 |
Data collection | |
Diffractometer | Nonius KappaCCD diffractometer |
Absorption correction | Multi-scan (SORTAV; Blessing, 1997) |
Tmin, Tmax | 0.942, 0.958 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 4352, 3202, 2783 |
Rint | 0.027 |
(sin θ/λ)max (Å−1) | 0.650 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.051, 0.121, 1.09 |
No. of reflections | 3202 |
No. of parameters | 200 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.45, −0.36 |
Computer programs: COLLECT (Hooft, 1998), DENZO (Otwinowski & Minor, 1997), SCALEPACK (Otwinowski & Minor, 1997), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), ORTEP-3 for Windows (Farrugia, 1997).
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1N···O2i | 0.86 | 2.03 | 2.872 (3) | 167.6 |
O3—H3O···O4 | 0.82 | 1.80 | 2.525 (3) | 146.0 |
C2—H2···O1ii | 0.93 | 2.54 | 3.279 (3) | 136.3 |
C14—H14···O2iii | 0.93 | 2.58 | 3.435 (3) | 152.9 |
C15—H15···N1 | 0.93 | 2.54 | 3.009 (4) | 111.8 |
Symmetry codes: (i) x+1, y, z; (ii) −x, −y+1, −z+1; (iii) −x, −y, −z+1. |
Acknowledgements
HLS is grateful to the Institute of Chemistry, University of the Punjab, for financial support.
References
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1,2-Benzothiazine 1,1-dioxides represent a class of pharmaceutically important heterocyclic compounds that have received considerable attention because of their dynamic structural features and a wide range of biological activity, e.g., anti-inflammatory (Lombardino & Wiseman, 1972), analgesic (Gupta et al., 2002), anti-cancer (Gupta et al., 1993), anti-bacterial (Zia-ur-Rehman et al., 2006) and endothelin receptor antagonists (Berryman et al., 1998), etc. In continuation of our research on the synthesis of biologically active benzothiazine derivatives (Ahmad et al., 2010), we herein report the synthesis and crystal structure of the title compound.
The title molecule is presented in Fig. 1. The bond distances are as expected (Allen et al., 1987) and agree with the corresponding parameters reported in closely related compounds (Siddiqui et al., 2008). The heterocyclic thiazine ring adopts a half chair conformation with atoms S1 and N1 displaced by 0.476 (5) and 0.227 (5) Å , respectively, on the opposite sides from the mean plane formed by the remaining ring atoms.
The structure is stabilized by intermolecular hydrogen bonds of the types N—H···O and C—H···O. In addition, intramolecular interactions O3—H3O···O4 and C15—H15···N1 are also present consolidating the crystal packing; details are provided in Table 1.