γ-CARBOXYPROPYLDISULFIDE3-Carboxypropyl disulfide4,4′-Dithiodibutyric acid4,4′-二硫代二丁酸Di(4-carboxybutyl) disulfide3-羧丙基二硫化物3-羧丙基二硫醚4,4'-dithiodibutyric acid4,4'-disulfanyldibutanoic acid4,4'-dithiodibutyric acid5,6-dithia-decanedioic acid4,4'-dithiodibutanoic acid4,4'-disulfanyldibutanoic acid