bis(2-methoxycarbonylphenyl) disulfide, bis(2-methoxycarbonylphenyl)sulfide, Dimethyl 2,2'-dithiodibenzoate, methyl 2-{[2-(methoxycarbonyl)phenyl]dithio}benzoate, methyl 2,2'-dithiosalicylate, 2-carbomethoxyphenyl disulfide, Methyl 2-{[2-(methoxycarbonyl)phenyl]disulfanyl}benzoate, methyl 2-(methoxycarbonylphenyl)disulfanylbenzoate, Dimethyl-2,2'-Dithiosalicylate, di-o-carbomethoxyphenyl disulfide, Dimethyl 2,2'-dithiobisbenzoate