1-Hexen-3-one, 5-methyl-1-phenyl- 2892-18-4 5-Methyl-1-phenyl-1-hexen-3-one 5-Methyl-1-phenylhex-1-en-3-one AI3-16642 EINECS 220-760-9 NSC 11849 NSC 31025 Styryl isobutyl ketone