Wiktionary
ethylmethylthiambutene
n. (context pharmaceutical drug English) An opioid painkiller, ''N-ethyl-N-methyl-4,4-dithiophen-2-yl-but-3-en-2-amine'', that has a narcotic effect
Wikipedia
Ethylmethylthiambutene
Ethylmethylthiambutene (N-ethyl-N-methyl-1-methyl-3,3-di-2-thienylallylamine; Emethibutin) is an opioid analgesic drug from the thiambutene family, around 1.3x the potency of morphine. It is under international control under Schedule I of the UN Single Convention On Narcotic Drugs 1961, presumably due to high abuse potential. It is a Schedule I controlled substance in the United States with a DEA ACSCN of 9623 and zero annual manufacturing quota as of 2013.