.DELTA.2-Angelica lactone .alpha.(.beta.,.gamma. or .DELTA.2)-Angelica lactone .alpha.-Angelica lactone .beta.,.gamma.-Angelica lactone .delta.(2)-Angelica lactone 2(3H)-Furanone, 5-methyl- 3-Pentenoic acid, 4-hydroxy-, .gamma.-lactone 4-Hydroxy-3-pentenoic acid .gamma.-lactone 4-Hydroxypent-3-enoic acid lactone 5-Methylfuran-2(3H)-one 591-12-8 NSC654 PENTEN-3-OIC ACID, 4-HYDROXY-, GAMMA-LACTONE WLN: T5OV CHJ E1