(2α,17S,19E)-17-Acetoxy-19,20-didehydroajmalan-16-carboxylic acid methyl ester

This carboline alkaloid has been isolated from Vinca difformis and V. minor and yields colourless prisms when crystallized from cydohexane. It is laevorotatory with [α]²⁰_D - 66° (c 0.52, CHCL3) or - 75° (c 1.0, CHCL3).

Janot, LeMen, Hammouda., Compt. rend., 243,85 (1956) Gosset, LeMen, Janot., Bull. Soc. Chim. Fr., 1033 (1961) Trojanek, Hodkova., Collect. Czech. Chem. Commun., 27,2981 (1962)