- Methyl (3aRS,3cRS,6cSR,7RS,8RS,8aSR)-2,5-bis(4-chlorophenyl)-7,9-bis(1,3-diphen yl-1H-pyrazol-4-yl)-1,3,4,6-tetraoxododecahydro-1H-dipyrrolo[3,4-a:3 %26apos;,4 %26apos;-f]pyrrolizine-3b-carboxylate dimethylformamide disolvate: a three-dimensional hydrogen-bonded framework