4-(2-aminoanilino)-2-methyl-2,3-dihydropyran-6-one

4-甲氧基-6-甲基-5,6-二氢吡喃-2-酮

5,6-dihydro-3,6-dimethyl-4-hydroxy-2H-pyran-2-one

3,3,6-trimethyldihydro-2H-pyran-2,4(3H)-dione