(2α,5α,16S)-2,5-Epoxy-1,2-dihydroakuammilan-17-oic acid methyl ester

Alstonia macrophylla Wall yields this carboline alkaloid which forms colourless crystals from Me2CO. It is laevorotatory with [α]²⁹_Dl>s - 90° (CHCI3), the ultraviolet spectrum exhibiting two absorption maxima at 234 and 286 mil in ethanolic solution.

Banerji, Chakrabarty, Mukherjee., Phytochem., 11, 2605 (1972)