(1)-2-Allyl-4-hydroxy-3-methylcyclopent-2-en-1-one 2-Cyclopenten-1-one, 2-allyl-4-hydroxy-3-methyl- (VAN) (8CI) 2-Cyclopenten-1-one, 4-hydroxy-3-methyl-2-(2-propenyl)- 2-Cyclopenten-1-one, 4-hydroxy-3-methyl-2-(2-propenyl)-, (+-)- 29605-88-7 551-45-1 AI3-20047 Allethrolon Allethrolone (VAN) EINECS 249-724-0 NSC 42192