1,3-Cyclopentanedicarboxylic acid, 4,5-dioxo-, diethyl ester 10088-87-6 4-10-00-03514 (Beilstein Handbook Reference) AI3-15187 BRN 2701878 Diethyl cyclopentane-4,5-dione-1,3-dicarboxylate NSC 118769 NSC 16956