methapyrilene
/mɛθəˈpɪrɪliːn/Pharmacology
noun
A pyridine derivative once used as an antihistamine and hypnotic, but later recognized to be a potent hepatic carcinogen in rats; N,N-dimethyl-N'-(2-thienylmethyl)-1,2-ethanediamine, C14H19N3S.
Origin
1940s; earliest use found in Journal of the American Medical Association. From meth- (in methyl: see note s.v. meth-) + -a- connective + pyril- + -ene.