diethyl 2-methylidenepentanedioate

3-hydroxy-2,2-dimethyl-1-phenylpropan-1-one

2-亚甲基戊二酸二甲酯

3,6,8-trimethyl-2,4-dihydro-1,3-benzoxazine

2,2-二羟基甲基-1-氮杂双环[2.2.2]辛-3-酮