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The title compound, C13H10ClN5O·0.5CH2Cl2, crystallizes with two independent 4-amino-6-chloro-8-p-tolyl­pteridin-7(8H)-one mol­ecules and one dichloro­methane mol­ecule in the asymmetric unit. The bond lengths and angles in the mol­ecules are within normal ranges. Inter­molecular N—H...N hydrogen bonds link the two independent mol­ecules into hydrogen-bonded dimers. The crystal packing is further stabilized by van der Waals forces.

Supporting information

cif

Crystallographic Information File (CIF) https://doi.org/10.1107/S1600536806020678/cv2063sup1.cif
Contains datablocks global, I

hkl

Structure factor file (CIF format) https://doi.org/10.1107/S1600536806020678/cv2063Isup2.hkl
Contains datablock I

CCDC reference: 613649

Key indicators

  • Single-crystal X-ray study
  • T = 298 K
  • Mean [sigma](C-C) = 0.005 Å
  • R factor = 0.054
  • wR factor = 0.145
  • Data-to-parameter ratio = 13.2

checkCIF/PLATON results

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Alert level C PLAT041_ALERT_1_C Calc. and Rep. SumFormula Strings Differ .... ? PLAT042_ALERT_1_C Calc. and Rep. MoietyFormula Strings Differ .... ? PLAT045_ALERT_1_C Calculated and Reported Z Differ by ............ 0.50 Ratio PLAT200_ALERT_1_C Check the Reported _diffrn_ambient_temperature . 293 K PLAT220_ALERT_2_C Large Non-Solvent C Ueq(max)/Ueq(min) ... 2.54 Ratio PLAT244_ALERT_4_C Low 'Solvent' Ueq as Compared to Neighbors for C27 PLAT340_ALERT_3_C Low Bond Precision on C-C bonds (x 1000) Ang ... 5 PLAT790_ALERT_4_C Centre of Gravity not Within Unit Cell: Resd. # 2 C13 H10 Cl N5 O
0 ALERT level A = In general: serious problem 0 ALERT level B = Potentially serious problem 8 ALERT level C = Check and explain 0 ALERT level G = General alerts; check 4 ALERT type 1 CIF construction/syntax error, inconsistent or missing data 1 ALERT type 2 Indicator that the structure model may be wrong or deficient 1 ALERT type 3 Indicator that the structure quality may be low 2 ALERT type 4 Improvement, methodology, query or suggestion

Computing details top

Data collection: SMART (Bruker, 1998); cell refinement: SAINT (Bruker, 1999); data reduction: SAINT; program(s) used to solve structure: SHELXTL (Bruker, 1999); program(s) used to refine structure: SHELXTL; molecular graphics: SHELXTL; software used to prepare material for publication: SHELXTL.

4-Amino-6-chloro-8-p-tolylpteridin-7(8H)-one dichloromethane hemisolvate top
Crystal data top
C13H10ClN5O·0.5CH2Cl2F(000) = 1352
Mr = 330.18Dx = 1.506 Mg m3
Monoclinic, P21/cMo Kα radiation, λ = 0.71073 Å
Hall symbol: -P 2yb cCell parameters from 1528 reflections
a = 7.4644 (14) Åθ = 2.4–22.4°
b = 16.138 (3) ŵ = 0.45 mm1
c = 24.402 (5) ÅT = 298 K
β = 97.676 (3)°Block, colourless
V = 2913.1 (10) Å30.24 × 0.18 × 0.15 mm
Z = 8
Data collection top
Bruker SMART CCD area-detector
diffractometer
5123 independent reflections
Radiation source: fine-focus sealed tube3183 reflections with I > 2σ(I)
Graphite monochromatorRint = 0.045
φ and ω scansθmax = 25.0°, θmin = 1.5°
Absorption correction: multi-scan
(SADABS; Sheldrick, 1996)
h = 88
Tmin = 0.899, Tmax = 0.935k = 1914
14411 measured reflectionsl = 2629
Refinement top
Refinement on F2Primary atom site location: structure-invariant direct methods
Least-squares matrix: fullSecondary atom site location: difference Fourier map
R[F2 > 2σ(F2)] = 0.054Hydrogen site location: inferred from neighbouring sites
wR(F2) = 0.145H-atom parameters constrained
S = 1.01 w = 1/[σ2(Fo2) + (0.0672P)2 + 0.1625P]
where P = (Fo2 + 2Fc2)/3
5123 reflections(Δ/σ)max < 0.001
389 parametersΔρmax = 0.31 e Å3
0 restraintsΔρmin = 0.32 e Å3
Special details top

Geometry. All e.s.d.'s (except the e.s.d. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell e.s.d.'s are taken into account individually in the estimation of e.s.d.'s in distances, angles and torsion angles; correlations between e.s.d.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell e.s.d.'s is used for estimating e.s.d.'s 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.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2) top
xyzUiso*/Ueq
Cl10.50437 (13)0.24914 (6)0.17574 (4)0.0683 (3)
Cl20.01401 (13)0.35300 (7)0.16980 (4)0.0689 (3)
Cl30.83601 (18)0.92666 (13)0.46429 (7)0.1526 (7)
Cl40.45459 (17)0.92713 (10)0.42933 (5)0.1146 (5)
O10.6735 (3)0.26461 (14)0.29114 (9)0.0580 (7)
O20.1615 (3)0.34698 (15)0.28728 (9)0.0574 (6)
N10.4519 (3)0.20083 (15)0.33138 (9)0.0383 (6)
N20.2610 (3)0.17828 (16)0.22621 (10)0.0425 (6)
N30.0385 (3)0.08222 (16)0.31353 (11)0.0493 (7)
N40.2270 (3)0.13060 (16)0.37118 (10)0.0457 (7)
N50.0752 (4)0.10424 (18)0.21943 (11)0.0592 (8)
H5B0.17830.07970.21670.071*
H5C0.03630.12340.19030.071*
N60.0721 (3)0.41235 (15)0.32089 (10)0.0376 (6)
N70.2438 (3)0.42520 (15)0.21243 (10)0.0412 (6)
N80.5708 (3)0.52221 (17)0.29016 (11)0.0486 (7)
N90.3144 (3)0.47896 (17)0.35377 (10)0.0480 (7)
N100.5861 (4)0.49876 (18)0.19714 (10)0.0556 (8)
H10A0.69020.52250.19260.067*
H10B0.54100.47970.16900.067*
C10.5284 (4)0.23031 (19)0.28627 (13)0.0417 (8)
C20.4147 (4)0.21365 (19)0.23294 (12)0.0422 (8)
C30.1948 (4)0.15071 (18)0.27302 (12)0.0381 (7)
C40.0246 (4)0.11251 (19)0.26881 (13)0.0419 (8)
C50.0689 (4)0.0930 (2)0.36085 (14)0.0513 (9)
H5A0.02590.07060.39170.062*
C60.2876 (4)0.16013 (18)0.32552 (12)0.0396 (7)
C70.5428 (4)0.2214 (2)0.38608 (12)0.0391 (7)
C80.5209 (4)0.2988 (2)0.40632 (13)0.0481 (8)
H8B0.45080.33760.38500.058*
C90.6023 (4)0.3195 (2)0.45828 (14)0.0559 (9)
H9B0.58780.37260.47180.067*
C100.7061 (5)0.2620 (3)0.49105 (14)0.0564 (10)
C110.7283 (5)0.1843 (3)0.46889 (14)0.0588 (10)
H11A0.79890.14520.48980.071*
C120.6483 (4)0.1635 (2)0.41664 (13)0.0504 (9)
H12A0.66530.11120.40220.060*
C130.7890 (6)0.2838 (3)0.54866 (15)0.0850 (13)
H13A0.88580.24600.56050.127*
H13B0.69880.28000.57320.127*
H13C0.83530.33930.54920.127*
C140.0148 (4)0.37972 (19)0.27917 (13)0.0430 (8)
C150.0904 (4)0.39132 (19)0.22330 (12)0.0415 (8)
C160.3230 (4)0.45446 (18)0.25646 (12)0.0360 (7)
C170.4951 (4)0.49155 (19)0.24749 (12)0.0409 (8)
C180.4745 (4)0.5132 (2)0.33982 (14)0.0538 (9)
H18A0.52830.53430.36910.065*
C190.2401 (4)0.44936 (18)0.31064 (12)0.0375 (7)
C200.0147 (4)0.4017 (2)0.37723 (12)0.0399 (7)
C210.0879 (5)0.4679 (2)0.40728 (14)0.0593 (10)
H21A0.08390.52050.39160.071*
C220.1673 (5)0.4563 (3)0.46083 (15)0.0682 (11)
H22A0.21510.50170.48130.082*
C230.1778 (5)0.3788 (3)0.48496 (14)0.0607 (10)
C240.1048 (4)0.3132 (2)0.45350 (14)0.0575 (9)
H24A0.11090.26030.46880.069*
C250.0228 (4)0.3241 (2)0.39988 (12)0.0453 (8)
H25A0.02650.27900.37940.054*
C260.2654 (6)0.3665 (3)0.54384 (14)0.0915 (16)
H26A0.25870.30910.55360.137*
H26B0.20340.39930.56820.137*
H26C0.38970.38330.54710.137*
C270.6316 (6)0.8908 (3)0.4762 (2)0.1137 (18)
H27A0.61140.90700.51320.136*
H27B0.63260.83080.47480.136*
Atomic displacement parameters (Å2) top
U11U22U33U12U13U23
Cl10.0739 (7)0.0861 (8)0.0460 (5)0.0283 (5)0.0127 (4)0.0014 (5)
Cl20.0648 (6)0.0900 (8)0.0528 (6)0.0192 (5)0.0107 (4)0.0140 (5)
Cl30.0767 (9)0.2105 (19)0.1740 (15)0.0068 (10)0.0285 (9)0.0752 (13)
Cl40.0883 (9)0.1710 (14)0.0836 (8)0.0010 (9)0.0081 (7)0.0404 (8)
O10.0473 (14)0.0700 (17)0.0562 (14)0.0279 (13)0.0046 (11)0.0028 (12)
O20.0445 (14)0.0702 (17)0.0559 (14)0.0216 (12)0.0006 (11)0.0080 (12)
N10.0338 (14)0.0427 (16)0.0381 (14)0.0072 (12)0.0032 (11)0.0001 (12)
N20.0402 (15)0.0383 (15)0.0484 (16)0.0028 (13)0.0035 (12)0.0068 (12)
N30.0382 (15)0.0485 (18)0.0606 (19)0.0087 (13)0.0045 (14)0.0023 (14)
N40.0366 (15)0.0498 (17)0.0505 (16)0.0082 (13)0.0055 (12)0.0014 (13)
N50.0399 (16)0.079 (2)0.0574 (18)0.0191 (15)0.0010 (14)0.0101 (16)
N60.0301 (13)0.0364 (15)0.0445 (15)0.0043 (11)0.0017 (11)0.0026 (12)
N70.0396 (15)0.0390 (15)0.0437 (15)0.0029 (12)0.0007 (12)0.0002 (12)
N80.0338 (14)0.0575 (18)0.0518 (17)0.0081 (13)0.0042 (13)0.0011 (14)
N90.0366 (15)0.0591 (18)0.0470 (16)0.0088 (13)0.0002 (12)0.0062 (14)
N100.0415 (16)0.075 (2)0.0471 (17)0.0142 (15)0.0042 (13)0.0072 (15)
C10.0407 (19)0.0352 (18)0.049 (2)0.0041 (15)0.0042 (15)0.0003 (15)
C20.046 (2)0.0394 (18)0.0415 (18)0.0030 (16)0.0058 (15)0.0040 (15)
C30.0323 (17)0.0360 (18)0.0458 (19)0.0000 (14)0.0041 (14)0.0061 (14)
C40.0327 (17)0.0378 (18)0.054 (2)0.0011 (14)0.0018 (16)0.0075 (16)
C50.044 (2)0.056 (2)0.055 (2)0.0089 (17)0.0113 (17)0.0010 (18)
C60.0333 (17)0.0368 (18)0.0490 (19)0.0005 (14)0.0062 (15)0.0017 (15)
C70.0318 (17)0.0424 (19)0.0428 (18)0.0080 (15)0.0035 (14)0.0007 (15)
C80.0423 (19)0.052 (2)0.048 (2)0.0002 (16)0.0037 (15)0.0017 (17)
C90.053 (2)0.058 (2)0.056 (2)0.0059 (19)0.0019 (18)0.0102 (19)
C100.044 (2)0.082 (3)0.042 (2)0.014 (2)0.0021 (16)0.002 (2)
C110.052 (2)0.069 (3)0.052 (2)0.003 (2)0.0029 (17)0.014 (2)
C120.048 (2)0.050 (2)0.051 (2)0.0014 (17)0.0007 (16)0.0035 (17)
C130.079 (3)0.119 (4)0.053 (2)0.019 (3)0.004 (2)0.002 (2)
C140.0385 (19)0.0403 (19)0.050 (2)0.0039 (15)0.0050 (15)0.0015 (15)
C150.0405 (19)0.0396 (19)0.0440 (18)0.0039 (15)0.0042 (15)0.0028 (14)
C160.0295 (16)0.0341 (17)0.0429 (18)0.0001 (13)0.0007 (13)0.0013 (14)
C170.0352 (18)0.0385 (19)0.048 (2)0.0019 (14)0.0013 (15)0.0061 (15)
C180.042 (2)0.064 (2)0.055 (2)0.0118 (18)0.0057 (17)0.0071 (18)
C190.0319 (17)0.0319 (17)0.0479 (19)0.0005 (14)0.0026 (14)0.0025 (14)
C200.0303 (16)0.046 (2)0.0414 (18)0.0060 (15)0.0023 (13)0.0062 (16)
C210.061 (2)0.048 (2)0.063 (2)0.0012 (18)0.0115 (19)0.0108 (18)
C220.063 (2)0.069 (3)0.065 (3)0.003 (2)0.016 (2)0.023 (2)
C230.045 (2)0.088 (3)0.045 (2)0.015 (2)0.0069 (16)0.011 (2)
C240.052 (2)0.065 (3)0.053 (2)0.0113 (19)0.0021 (17)0.0046 (19)
C250.0400 (18)0.051 (2)0.0430 (19)0.0016 (16)0.0026 (15)0.0040 (16)
C260.078 (3)0.141 (4)0.048 (2)0.028 (3)0.017 (2)0.016 (2)
C270.093 (4)0.124 (4)0.123 (4)0.005 (3)0.009 (3)0.043 (4)
Geometric parameters (Å, º) top
Cl1—C21.724 (3)C7—C81.361 (4)
Cl2—C151.722 (3)C7—C121.376 (4)
Cl3—C271.693 (5)C8—C91.372 (4)
Cl4—C271.730 (5)C8—H8B0.9300
O1—C11.208 (3)C9—C101.391 (5)
O2—C141.208 (3)C9—H9B0.9300
N1—C61.382 (4)C10—C111.385 (5)
N1—C11.390 (4)C10—C131.500 (5)
N1—C71.453 (3)C11—C121.375 (4)
N2—C21.272 (4)C11—H11A0.9300
N2—C31.378 (4)C12—H12A0.9300
N3—C51.326 (4)C13—H13A0.9600
N3—C41.337 (4)C13—H13B0.9600
N4—C51.321 (4)C13—H13C0.9600
N4—C61.344 (4)C14—C151.492 (4)
N5—C41.336 (4)C16—C191.385 (4)
N5—H5B0.8600C16—C171.408 (4)
N5—H5C0.8600C18—H18A0.9300
N6—C191.381 (3)C20—C211.368 (4)
N6—C141.382 (4)C20—C251.368 (4)
N6—C201.450 (4)C21—C221.374 (5)
N7—C151.264 (4)C21—H21A0.9300
N7—C161.377 (4)C22—C231.380 (5)
N8—C181.332 (4)C22—H22A0.9300
N8—C171.344 (4)C23—C241.377 (5)
N9—C181.319 (4)C23—C261.510 (5)
N9—C191.341 (4)C24—C251.379 (4)
N10—C171.327 (3)C24—H24A0.9300
N10—H10A0.8600C25—H25A0.9300
N10—H10B0.8600C26—H26A0.9600
C1—C21.480 (4)C26—H26B0.9600
C3—C61.381 (4)C26—H26C0.9600
C3—C41.404 (4)C27—H27A0.9700
C5—H5A0.9300C27—H27B0.9700
C6—N1—C1122.2 (2)C10—C13—H13A109.5
C6—N1—C7120.2 (2)C10—C13—H13B109.5
C1—N1—C7117.3 (2)H13A—C13—H13B109.5
C2—N2—C3117.1 (3)C10—C13—H13C109.5
C5—N3—C4115.1 (3)H13A—C13—H13C109.5
C5—N4—C6113.3 (3)H13B—C13—H13C109.5
C4—N5—H5B120.0O2—C14—N6123.4 (3)
C4—N5—H5C120.0O2—C14—C15124.0 (3)
H5B—N5—H5C120.0N6—C14—C15112.6 (3)
C19—N6—C14122.4 (2)N7—C15—C14126.7 (3)
C19—N6—C20120.2 (2)N7—C15—Cl2119.0 (2)
C14—N6—C20117.3 (2)C14—C15—Cl2114.3 (2)
C15—N7—C16117.1 (2)N7—C16—C19122.7 (3)
C18—N8—C17115.7 (3)N7—C16—C17120.2 (3)
C18—N9—C19113.7 (3)C19—C16—C17117.1 (3)
C17—N10—H10A120.0N10—C17—N8118.0 (3)
C17—N10—H10B120.0N10—C17—C16121.7 (3)
H10A—N10—H10B120.0N8—C17—C16120.4 (3)
O1—C1—N1122.4 (3)N9—C18—N8129.8 (3)
O1—C1—C2124.8 (3)N9—C18—H18A115.1
N1—C1—C2112.7 (3)N8—C18—H18A115.1
N2—C2—C1126.6 (3)N9—C19—N6118.2 (3)
N2—C2—Cl1119.0 (2)N9—C19—C16123.3 (3)
C1—C2—Cl1114.4 (2)N6—C19—C16118.5 (3)
N2—C3—C6122.9 (3)C21—C20—C25120.4 (3)
N2—C3—C4120.2 (3)C21—C20—N6120.8 (3)
C6—C3—C4116.9 (3)C25—C20—N6118.8 (3)
N5—C4—N3119.0 (3)C20—C21—C22119.6 (3)
N5—C4—C3120.0 (3)C20—C21—H21A120.2
N3—C4—C3121.0 (3)C22—C21—H21A120.2
N4—C5—N3130.3 (3)C21—C22—C23121.5 (3)
N4—C5—H5A114.8C21—C22—H22A119.3
N3—C5—H5A114.8C23—C22—H22A119.3
N4—C6—C3123.2 (3)C24—C23—C22117.6 (3)
N4—C6—N1118.3 (3)C24—C23—C26121.2 (4)
C3—C6—N1118.5 (3)C22—C23—C26121.2 (4)
C8—C7—C12121.0 (3)C23—C24—C25121.6 (4)
C8—C7—N1118.7 (3)C23—C24—H24A119.2
C12—C7—N1120.4 (3)C25—C24—H24A119.2
C7—C8—C9119.9 (3)C20—C25—C24119.3 (3)
C7—C8—H8B120.0C20—C25—H25A120.3
C9—C8—H8B120.0C24—C25—H25A120.3
C8—C9—C10120.9 (3)C23—C26—H26A109.5
C8—C9—H9B119.5C23—C26—H26B109.5
C10—C9—H9B119.5H26A—C26—H26B109.5
C11—C10—C9117.8 (3)C23—C26—H26C109.5
C11—C10—C13121.5 (4)H26A—C26—H26C109.5
C9—C10—C13120.8 (4)H26B—C26—H26C109.5
C12—C11—C10121.6 (3)Cl3—C27—Cl4113.4 (3)
C12—C11—H11A119.2Cl3—C27—H27A108.9
C10—C11—H11A119.2Cl4—C27—H27A108.9
C11—C12—C7118.9 (3)Cl3—C27—H27B108.9
C11—C12—H12A120.6Cl4—C27—H27B108.9
C7—C12—H12A120.6H27A—C27—H27B107.7
C6—N1—C1—O1178.7 (3)C19—N6—C14—O2179.9 (3)
C7—N1—C1—O17.3 (4)C20—N6—C14—O23.7 (4)
C6—N1—C1—C20.4 (4)C19—N6—C14—C151.5 (4)
C7—N1—C1—C2173.7 (2)C20—N6—C14—C15177.7 (2)
C3—N2—C2—C11.7 (5)C16—N7—C15—C140.1 (5)
C3—N2—C2—Cl1179.8 (2)C16—N7—C15—Cl2179.6 (2)
O1—C1—C2—N2179.5 (3)O2—C14—C15—N7179.8 (3)
N1—C1—C2—N21.5 (5)N6—C14—C15—N71.2 (5)
O1—C1—C2—Cl11.0 (4)O2—C14—C15—Cl20.5 (4)
N1—C1—C2—Cl1180.0 (2)N6—C14—C15—Cl2179.1 (2)
C2—N2—C3—C60.1 (4)C15—N7—C16—C191.2 (4)
C2—N2—C3—C4178.8 (3)C15—N7—C16—C17178.9 (3)
C5—N3—C4—N5180.0 (3)C18—N8—C17—N10179.8 (3)
C5—N3—C4—C31.6 (4)C18—N8—C17—C161.4 (4)
N2—C3—C4—N51.3 (4)N7—C16—C17—N100.6 (4)
C6—C3—C4—N5177.5 (3)C19—C16—C17—N10179.5 (3)
N2—C3—C4—N3177.1 (3)N7—C16—C17—N8178.2 (3)
C6—C3—C4—N34.1 (4)C19—C16—C17—N81.7 (4)
C6—N4—C5—N31.9 (5)C19—N9—C18—N80.2 (5)
C4—N3—C5—N41.6 (5)C17—N8—C18—N90.4 (5)
C5—N4—C6—C31.1 (4)C18—N9—C19—N6179.9 (3)
C5—N4—C6—N1179.9 (3)C18—N9—C19—C160.2 (4)
N2—C3—C6—N4177.4 (3)C14—N6—C19—N9179.7 (3)
C4—C3—C6—N43.8 (4)C20—N6—C19—N93.7 (4)
N2—C3—C6—N11.6 (4)C14—N6—C19—C160.6 (4)
C4—C3—C6—N1177.1 (3)C20—N6—C19—C16176.6 (3)
C1—N1—C6—N4177.3 (3)N7—C16—C19—N9178.8 (3)
C7—N1—C6—N48.8 (4)C17—C16—C19—N91.1 (4)
C1—N1—C6—C31.8 (4)N7—C16—C19—N60.9 (4)
C7—N1—C6—C3172.1 (3)C17—C16—C19—N6179.2 (3)
C6—N1—C7—C896.4 (3)C19—N6—C20—C2173.5 (4)
C1—N1—C7—C877.8 (3)C14—N6—C20—C21110.3 (3)
C6—N1—C7—C1283.5 (4)C19—N6—C20—C25106.7 (3)
C1—N1—C7—C12102.4 (3)C14—N6—C20—C2569.5 (4)
C12—C7—C8—C91.1 (5)C25—C20—C21—C221.0 (5)
N1—C7—C8—C9178.8 (3)N6—C20—C21—C22179.2 (3)
C7—C8—C9—C100.6 (5)C20—C21—C22—C231.0 (6)
C8—C9—C10—C111.7 (5)C21—C22—C23—C240.3 (6)
C8—C9—C10—C13177.6 (3)C21—C22—C23—C26180.0 (4)
C9—C10—C11—C121.1 (5)C22—C23—C24—C250.4 (5)
C13—C10—C11—C12178.2 (3)C26—C23—C24—C25179.3 (3)
C10—C11—C12—C70.6 (5)C21—C20—C25—C240.3 (5)
C8—C7—C12—C111.7 (5)N6—C20—C25—C24179.9 (3)
N1—C7—C12—C11178.2 (3)C23—C24—C25—C200.4 (5)
Hydrogen-bond geometry (Å, º) top
D—H···AD—HH···AD···AD—H···A
N5—H5B···N8i0.862.082.937 (4)179
N10—H10A···N3ii0.862.233.089 (4)176
Symmetry codes: (i) x1, y1/2, z+1/2; (ii) x1, y+1/2, z+1/2.
 

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