ethyl N-piperidin-1-ylcarbamate

(1-(cyclopent-1-en-1-yl)piperidin-1-ium-1-yl)(ethoxycarbonyl)amide

ethyl (2-oxocyclopentyl)carbamate

2,3-二氢-1H-环戊并[b]喹啉

2,3,5,6,7,8-hexahydro-1H-cyclopenta[b]chromen-9-one