The molecular formula C19H23NO4 (molar mass : 329.39 g/mol, exact mass : 329.162708) may refer to:
- 14-Methoxymetopon
- Methylecgonine cinnamate
- Naloxol
- Reticuline
- Salutaridinol, an alkaloid
- Sinomenine, an alkaloid
The molecular formula C19H23NO4 (molar mass : 329.39 g/mol, exact mass : 329.162708) may refer to: