[Studies on the Nepalese crude drugs. XVII. On the naphthalene related compounds from the root bark of Oroxylum indicum VENT].

Nine new naphthalene related compounds (I, IV, V, VII-XII) together with four known compounds (II, III, VI, XIII) were isolated from the root bark of Oroxylum indicum Vent. (Bignoniaceae), one of the Nepalese crude drugs. Their structures were determined based on chemical and physiocochemical evidence.