戊二酸二甲酯

6-methoxy-1,2,3,9-tetrahydrocarbazol-4-one

2-(oxomethylidene)cyclopentan-1-one

(2Z)-2-hydroxyimino-3-phenyl-3,5,6,7-tetrahydro-1-benzofuran-4-one

3-prop-2-enoxycyclohex-2-en-1-one