In the title compound, C(19)H(15)NO(2), the mol-ecule adopts a syn configuration with the naphthalene and N-phenyl-formamide units located on the same side of the ep-oxy ring. The ep-oxy ring makes dihedral angles of 58.73 (9) and 65.18 (9)°, respectively, with the naphthalene ring system and the benzene ring. Inter-molecular N-H⋯O and C-H⋯O hydrogen bonding is present in the crystal structure.