Composition #7: MAJUMDER, PL., JOARDAR, S., CHANDA, TK., DINDA, BN., BANERJEE, M., RAY, AB., CHATTERJEE, A., VARENNE, P., DAS, BC. STRUCTURES AND ABSOLUTE STEREOCHEMISTRY OF (-)-ECHITOVENILINE,(-)-11-METHOXYECHITOVENILINE AND (-)-11-METHOXYECHITOVENEDINE - NEW INDOLE ALKALOIDS OF ALSTONIA-VENENATA RBR. TETRAHEDRON, 1979, vol. 35, no. 9, p. 1151–1157. DOI: 10.1016/S0040-4020(01)93738-X.
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