diethyl 2,2,7,7-tetramethyl-3,6-dioxooctanedioate

2,3-bis[(4-propan-2-ylphenyl)methylidene]butanedioic acid

琥珀酸 1-乙酯 4-甲酯

乙基beta-乙氧羰基-gamma-氧代-3-吡啶丁酸酯

2-[bis(4-methoxyphenyl)methylidene]butanedioic acid