thiocarbonic acid O-benzyl ester-S-(2-nitro-phenyl ester)
thiocarbonic acid O,S-bis-(2-nitro-phenyl ester)
thiocarbonic acid S-(2-nitro-phenyl ester)-O-phenyl ester
thiocarbonic acid O-ethyl ester-S-(2-nitro-phenyl ester)
thiocarbonic acid O-methyl ester-S-(2-nitro-phenyl ester)