The molecular formula C20H25N3O2 (molar mass: 339.43 g/mol, exact mass: 339.1947 u) may refer to:

Trilyakine 3-Hydroxy-LSD 12-Hydroxy-LSD 13-Hydroxy-LSD 14-Hydroxy-LSD 2-Oxo-LSD Lysergic acid ethyl-2-hydroxyethylamide Methylergometrine, or methylergonovine Propisergide WAY-317,538 (SEN-12333)