15-Methoxy-14,15-dihydroandranginine

Abstract

The title polycyclic alkaloid, C22H26N2O3, an indole derivative obtained from Melodinus yunnanensis, comprises three chiral C atoms and crystallizes as a racemate. Its seven-membered heterocyclic ring has a twisted conformation, with the N atom within the plane of the indole moiety and with two adjacent C atoms deviating in opposite directions from its plane by 0.756 (3) (methylene C) and −0.802 (3) Å (methine C). In the crystal, pairs of N—H...O hydrogen bonds connect the molecules into centrosymmetric dimers.