Synonyms: 20-Norcrotalanan-11,15-dione,12,13-[ethylidenebis(oxy)]-14,19-dihydro-, (13a,14a)-;7H-[1,3]Dioxolo[8,9][1,6]dioxacycloundecino[2,3,4-gh]pyrrolizine-7,12(8H)-dione,2,4,5,5a,8a,11a,14,14b-octahydro-8,8a,10,11a-tetramethyl-,(5aR,8R,8aR,11aR,14bR)-[partial]-; Monocrotalinine