Experimental Crystal data

R factor = 0.039; wR factor = 0.111; data-to-parameter ratio = 15.5. In the title compound, C27H28N2O4, the pyrrolidine ring adopts a twist conformation. The plane of the indole ring is almost perpendicular to that of the pyrrolidine ring, making a dihedral angle of 88.50 (6). The planes of the naphthyl ring system and the pyrrolidine ring are tilted by an angle of 55.86 (5). The molecular conformation is stabilized by intramolecular O—H O and O—H N hydrogen bonds. Related literature For general background to spiro compounds and their biolo