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1.  Ethyl 5-methyl-1H-pyrrole-2-carboxyl­ate 
In the title mol­ecule, C8H11NO2, the r.m.s. deviation of non-H atoms from their best plane is 0.031 Å. Mol­ecules are connected via a pair of N—H⋯O hydrogen bonds into a centrosymmetric dimer.
PMCID: PMC3151843  PMID: 21836994
2.  Ethyl 5-{[(E)-2-(isonicotinoyl)hydrazinyl­idene]methyl}-3,4-dimethyl-1H-pyrrole-2-carboxyl­ate dihydrate 
In the title compound, C16H18N4O3·2H2O, the dihedral angle between the pyrrole and pyridine rings in the hydrazone mol­ecule is 7.12 (3)°. In the crystal structure, inter­molecular N—H⋯O, O—H⋯N and O—H⋯O hydrogen bonds link the hydrazone and water mol­ecules into double layers parallel to (101). The crystal packing exhibits weak π–π inter­actions between the pyrrole and pyridine rings of neighbouring hydrazone mol­ecules [centroid–centroid distance = 3.777 (3) Å]. The crystal studied was a non-merohedral twin, the refined ratio of twin domains being 0.73 (3):0.27 (3).
PMCID: PMC3120595  PMID: 21754795
3.  (E,E)-3,3′-Dimethyl-1,1′-diphenyl-4,4′-{[3-aza­pentane-1,5-diylbis(aza­nedi­yl)]bis­(phenyl­methyl­idyne)}di-1H-pyrazol-5(4H)-one 
The asymmetric unit of the title compound, C38H37N7O2, contains one half-mol­ecule, situated on a twofold rotational axis, in which one amino group is involved in intra­molecular N—H⋯O hydrogen bond and the two phenyl rings are twisted from the plane of pyrazolone ring by 26.69 (10) and 79.64 (8)°. The crystal packing exhibits no classical inter­molecular contacts.
PMCID: PMC3011678  PMID: 21589602

Results 1-3 (3)