metopon
noun
met·o·pon
ˈmet-ə-ˌpän 
: a narcotic drug that is derived from morphine and is used in the form of its hydrochloride C18H21NO3·HCl to relieve pain
called also methyldihydromorphinone
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“Metopon.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/metopon. Accessed 18 Apr. 2024.
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