4-(4-methoxyanilino)-4-oxobutanoic acid

1-(2-methoxyethyl)pyrrolidine-2,5-dione

(2,5-二氧代吡咯烷-1-基)乙酸

单丁基琥珀酸酯

Butanedioic acid, mono[5-methyl-2-(1-methylethyl)phenyl] ester (en)