2(5H)-FURANONE, 5-PHENYL- 5-Phenyl-2(5H)-furanone 5-Phenyl-4-hydroxybutenolid-(1,4) 5-Phenylfuran-2(5H)-one 53138-45-7 Crotonic acid, 4-hydroxy-4-phenyl-, gamma-lactone EINECS 258-387-9