What is the physicochemical property of WST-8 and MTS?

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Halin
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What is the physicochemical property of WST-8 and MTS?

WST-8: (2-(2-methoxy-4-nitrophenyl)-3-(4-nitrophenyl)-5-(2,4-disulfophenyl)-2H-tetrazolium, monosodium salt)
Its structural formula is given in the attachment file.

1.How about its physicochemical property?

2.And one of the point is how about its stability. Is it labile under the light and in air?

3.How to use and store it in the experiment?

The same questions about MTS(3-(4,5-Dimethylthiazol-2-yl)-5-(3-carboxymethoxyphenyl)-2-(4-sulfophenyl)-2H-tetrazolium)

Thank you very much! Best regards.