2,2',2'',2'''-((((1,1-Doxido-3H-benzo[c][1,2]oxathiole-3,3-diyl)bis(6-hydroxy-5-methyl-3,1-phenylene))bis(methylene))bis(azanetriyl))tetraacetic acid disodium salt

2,2',2'',2'''-((((1,1-Doxido-3H-benzo[c][1,2]oxathiole-3,3-diyl)bis(6-hydroxy-5-methyl-3,1-phenylene))bis(methylene))bis(azanetriyl))tetraacetic acid disodium salt