(3R,4R,5R,13aR,13bR)-4,5,8,10,12,13,13a,13b-Octahydro-4,5-dihydroxy-3,4,5-trimethyl-2H-[1,6]dioxacycloundecino[2,3,4-gh]pyrrolizine-2,6(3H)-dione; (13?,14?)-14,19-dihydro-12,13-dihydroxy-20-Norcrotalanan-11,15-dione; (-)-Monocrotaline; Monocrotalin; NSC 28693; Crotaline;Monocrotaline