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Y	Z

2-Mercapto-3-butanol

3-Mercapto-2-butanol

4-Mercaptobenzyl alcohol

2-Mercaptobenzoxazole

2-Mercaptobenzothiazolyl-(Z)-(2-aminothiazol-4-yl)-2-(tert-butoxycarbonyl) isopropoxyiminoacetate

2-Mercaptobenzothiazole

2-Mercaptobenzothazolyl (Z)-2-(2-aminothiazol-4-yl)-2-(tert-butoxycarbonylmethoxyimino)acetate

4-Mercaptobenzoic acid

2-Mercaptobenzimidazol zinc salt

2-Mercaptobenzimidazole