2-环戊酮羧酸

2-氧代环戊羧酸乙酯

N-phenyl-adipamic acid ethyl ester

3-phenyl-6,7-dihydro-5H-cyclopenta[e][1,3]oxazine-2,4-dione

2-anilino-cyclopent-1-enecarboxylic acid anilide