芴-9-螺-5'-恶唑烷二酮

1-氧杂-3-氮杂螺[4.4]壬烷-2,4-二酮

2-氧代辛酸乙酯

ethyl N-[2-(1H-indol-3-yl)ethyl]carbamate

3-oxa-1-azaspiro[4.5]decan-2-one