Synonyms: Thieno[1',2':1,2]thieno[3,4-d]imidazol-5-ium, 1,3-dibenzyldecahydro-2-oxo- (8CI);Thieno[1',2':1,2]thieno[3,4-d]imidazol-5-ium, decahydro-2-oxo-1,3-bis(phenylmethyl)- (9CI);trimetaphan;Trimethaphan;9,11-Dibenzyl-6-thionia-9,11-diazatricyclo[6.3.0.02,6]undecan-10-one;Decahydro-2-oxo-1,3-bis(phenylmethyl)thieno[1',2':1,2]thieno[3,4-d]imidazol-5-ium