2-methyl-2-prop-2-ynylpropane-1,3-diol

丙基丙二酸二甲酯

dimethyl 2-but-1-enyl-2-prop-1-ynylpropanedioate

dimethyl 2-(3-oxopropyl)propanedioate

dimethyl 2-pent-1-ynylpropanedioate