丁位己内酯

3-戊烯-2-酮

4-anilino-2-methyl-2,3-dihydropyran-6-one

methyl-6 dihydro-5,6 N-paraaminoanilino-4 pyrone-2

2-methyl-4-[4-[(2-methyl-6-oxo-2,3-dihydropyran-4-yl)amino]anilino]-2,3-dihydropyran-6-one