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Levomethorphan

Drug
Levomethorphan is an opioid analgesic of the morphinan family that has never been marketed. It is the L-stereoisomer of racemethorphan. The effects of the two isomers of racemethorphan are quite different, with dextromethorphan being an... Wikipedia
Molar mass: 271.4 g/mol
Formula: C18H25NO
Elimination half-life: 3-6 hours