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The title compound, C19H19N3O2, crystallizes with two independent mol­ecules (A and B) in the asymmetric unit. In mol­ecule A, the pyrazole ring adopts a slightly disordered half-chair conformation while in B it is planar [r.m.s. deviation = 0.0386 (15) Å]. The dihedral angle between the mean planes of the two phenyl rings is 56.2 (8) in A and 38.2 (3)° in B. The N-phenyl substituent on the pyrazole ring is twisted by 46.5 (2) in A and 58.6 (4)° in B while the extended phenyl ring is twisted by 82.2 (8) in A and 87.5 (9)° in B. The mean plane of the amide group forms an angle of 74.8 (3) in A and 67.7 (1)° in B with respect to the phenyl ring. In addition, the amide group is rotated by 51.4 (1) in A and 53.6 (2)° in B from the the mean plane of the pyrazole ring. In the crystal, the two molecules are linked via N—H...O hydrogen bonds, supported by weak C—H...O inter­actions, forming dimers enclosing an R22(10) ring motif. The dimers are linked via C—H...O inter­actions, forming a three-dimensional structure.

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The hydrated title compound [systematic name: N-(4-fluoro­benz­yl)-5-hy­droxy-1-methyl-2-{1-methyl-1-[(5-methyl-1,3,4-oxa­diazol-2-ylcarbon­yl)amino]­eth­yl}-6-oxo-1,6-di­hydro­pyrimidine-4-carb­oxamide monohydrate], C20H21FN6O5·H2O, is recognised as the first HIV integrase inhibitor. In the mol­ecule, the dihedral angles between the mean planes of the pyrimidine ring and the phenyl and oxa­diazole rings are 72.0 (1) and 61.8 (3)°, respectively. The mean plane of the oxa­diazole ring is twisted by 15.6 (3)° from that of the benzene ring, while the mean plane of amide group bound to the oxadiaole ring is twisted by 18.8 (3)° from its mean plane. Intra­molecular O—H...O and C—H...N hydrogen bonds are observed in the mol­ecule. The crystal packing features O—H...O hydrogen bonds, which include bifurcated O—H...(O,O) hydrogen bonds from one H atom of the water mol­ecule. In addition, N—H...O hydrogen bonds are observed involving the two amide groups. These inter­actions link the mol­ecules into chains along [010].

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The title compound, C12H12FNO3, crystallizes with two independent mol­ecules (A and B) in the asymmetric unit. The dihedral angle between the mean planes of the 3-fluoro-4-methyl­phenyl ring and the oxo­amine group is 25.7 (7)° in mol­ecule A and 71.3 (7)° in mol­ecule B, while the mean plane of the 2-methyl­idene-4-oxo­butanoic acid group is twisted by 76.2 (1)° from that of the oxo­amine group in mol­ecule A and by 76.2 (4)° in mol­ecule B. In the crystal, N—H...O and O—H...O hydrogen bonds [the latter forming an R22(8) graph-set motif] link the mol­ecules into a two-dimensional network parallel to the ac plane.

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The asymmetric unit of the title compound, C21H18ClFO3, contains two independent mol­ecules. In one mol­ecule (A), the 4-chloro­phenyl, oxo­cyclo­hex-3-ene, carboxyl­ate, and ethyl groups were refined as disordered over two sets of sites with a 0.684 (5):0.316 (5) ratio. The cyclo­hexene ring in the disordered mol­ecule is in a slightly distorted envelope conformation for the major component (with the C atom bound to the carboxylate group being the flap atom) and in a screw-boat conformation for the minor component. In the ordered mol­ecule (B), the cyclo­hexene ring is in a half-chair conformation. The dihedral angles between the mean planes of the fluoro- and chloro-substituted benzene rings are 89.9 (7) (only the major component is considered for A) and 76.4 (7)° (B). In the crystal, inversion dimers are observed along with weak C—H...O hydrogen bonds, which form chains along [100].
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