C20H23NO4

The molecular formula C20H23NO4 may refer to:


 * Efaproxiral, an allosteric effector of hemoglobin
 * Isopavine, an alkaloid
 * 6-Monoacetylcodeine, a codein ester
 * Naltrexone, a medication primarily used to manage alcohol dependence
 * Osemozotan, an experimental drug candidate
 * Pavine, an alkaloid found in poppy species
 * Thebacon, a semisynthetic opioid used as an analgesic