Synonyms: 20-Norcrotalanan-11,15-dione,14,19-dihydro-12-hydroxy-, (13a,14a)-; (-)-Crotaleschenine;1,2-Didehydroretusine;2H-[1,6]Dioxacycloundecino[2,3,4-gh]pyrrolizine-2,6(3H)-dione,4,5,8,10,12,13,13a,13b-octahydro-5-hydroxy-3,4,5-trimethyl-,[3R-(3R*,4S*,5R*,13aR*,13bR*)]-; Crotaleschenine