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2-methyl oxazole 4-ethyl ester Guaifenesin Cyclopropane Cyclopropanecarboxylic acid ETHYL 1-METHYLCYCLOPROPANE-1-CARBOXYLATE 1-Cyano-1-cyclopropanecarboxylic acid 1-Phenyl-1-cyclopropanecarboxylic acid 6,6-DIMETHYL-5,7-DIOXASPIRO[2.5]OCTANE-4,8-DIONE ETHYL 1-CYANOCYCLOPROPANECARBOXYLATE 1-CARBOXYCYCLOPROPANECARBOXAMIDE