C21H25NO2
# C21H25NO2

The molecular formula $C_{21}H_{25}NO_2$ (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
