Synonyms: 5,9:7,10a-Dimethano-10aH-[1,3]dioxocino[6,5-d]pyrimidine-4,7,10,11,12-pentol,2-amino-1,4,4a,5,9,10-hexahydro-12-(hydroxymethyl)-,(4S,4aR,5R,7S,9S,10S,10aR,11S,12S)- (9CI); Tetrodotoxin, (4b)-; 4-Epitetrodotoxin;4-epi-Tetrodotoxin; 5,9:7,10a-Dimethano-10aH-[1,3]dioxocino[6,5-d]pyrimidine-4,7,10,11,12-pentol,octahydro-12-(hydroxymethyl)-2-imino-, [4S-(4a,4ab,5b,7b,9b,10b,10aa,11R*,12R*)]-