3-Cyclopropyl-2-methyl-4-oxo-2-cyclopenten-1-yl 2,2,3,3-tetramethylcyclopropanecarboxylate 81910-08-9 Cyclopropanecarboxylic acid, 2,2,3,3-tetramethyl-, 3-cyclopropyl-2-methyl-4-oxo-2-cyclopenten-1-yl ester