Origin of metopon hydrochloride
"metopon hydrochloride." YourDictionary, n.d. Web. 21 June 2018. <http://www.yourdictionary.com/metopon-hydrochloride>.
metopon hydrochloride. (n.d.). Retrieved June 21st, 2018, from http://www.yourdictionary.com/metopon-hydrochloride
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