2-hydroxyethyl 2-hydroxyacetate

乙醇酸苯甲酯

methyl 3-(2-methoxy-2-oxoethoxy)-3-(5-methyl-2,4-dioxopyrimidin-1-yl)propanoate

(2-methoxy-2-oxoethyl) 3-oxobutanoate

羟基乙酸