Indole-3-spiro-N-methyl-2′-pyrrolidine-3′-spiro-9"-anthracene-2,10"-dione

The asymmetric unit of the title compound, C25H20N2O2, contains an enantiomeric pair of molecules, which are linked by N-H...O hydrogen bonds involving N-H and C=O groups of the pyrrole ring. In both molecules, the central six-membered ring of the anthrone moiety adopts a boat conformation, the pyrrolidine ring adopts an envelope conformation and the five-membered ring in the oxindole moiety is slightly distorted from planarity. Both the anthrone and oxindole moieties are almost perpendicular to the pyrrolidine ring.