Methyl (αE,1′R,6′S,7′S,8′aR)-6′-ethyl-1,2,2′,3′,6′,7′,8′,8′a-octahydro-4-hydroxy-α-(methoxymethylene)-2-oxospiro[3H-indole-3,1′(5′H)-indolizine]-7′-acetate

개요The leaves of Mitragyna speciosa Korth contain this alkaloid which crystallizes from EtOH in colourless needles. It is laevorotatory with [α]22D - 103° (c 2.0, CHCI3). The ultraviolet spectrum has absorption maxima at 223, 242 and 290 mJ.1. The alkaloid has been shown to be a stereoisomer of rotundifoline (q.v.).