16913-31-8 1H-Indene-4-propanoic acid, 2,3,5,6,7,7a-hexahydro-7a-methyl-1,5-dioxo- 21932-65-0 25110-82-1 7a-Methyl-5,6,7,7a-tetrahydro-1,5-dioxo-4-indanpropionic acid 7a-Methyl-5,6,7,7a-tetrahydroindan-1,5-dione-4-(3-propionic acid)