The molecular formula C21H25NO2 (molar mass: 323.43 g/mol) may refer to:
- 4-Hydroxy-1-methyl-4-(4-methylphenyl)-3-piperidyl 4-methylphenyl ketone
- PEPAP, an opioid analgesic
- Piperidolate, an antimuscarinic
This set index page lists chemical structure articles associated with the same molecular formula.
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