Methyl 1′-(3-hydroxy-2-oxo-2,3-dihydro-1H-indol-3-yl)-2-oxo-2,3-dihydro-1H-indole-3-spiro-3′-pyrrolizidine-1′-carboxylate

In the title compound, C24H23N3O5, one of the pyrrolidine rings in the pyrrolizine ring system adopts an envelope conformation, whereas the other ring adopts an envelope conformation. Both indol-2-one ring systems are essentially planar. The molecule is stabilized by an intramolecular O-H center dot center dot center dot O hydrogen bond which generates an S(8) motif. The molecules are linked into a two-dimensional network parallel to the 10(1) over bar plane by intermolecular N-H center dot center dot center dot O and C-H center dot center dot center dot O hydrogen bonds.