Synonyms: Cyclopentanecarboxylicacid, 2-[(2,4-dinitrophenyl)hydrazono]-, ethyl ester (9CI);Cyclopentanecarboxylic acid, 2-oxo-, ethyl ester, (2,4-dinitrophenyl)hydrazone(6CI,7CI); Cyclopentanecarboxylic acid, 2-oxo-, ethyl ester,2-[(2,4-dinitrophenyl)hydrazone] (8CI); NSC 287538