C19H21NO4

The molecular formula C19H21NO4 (molar mass : 327.37 g/mol) may refer to :
 * Acetylmorphone, a semi-synthetic opiate analogue
 * Boldine
 * Isoteolin (isoboldine)
 * 3-Monoacetylmorphine
 * 6-Monoacetylmorphine
 * Naloxone
 * (+)-Naloxone
 * Salutaridine
 * Scoulerine
 * Stepholidine