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Dimethyl 3,4-dihydroxythiophene-2,5-dicarboxylate
58416-04-9
C8H8O6S
3,4-Dihydroxy-thiophene-2,5-dicarboxylic acid dimethyl ester 

Item of testing  Specification Result 
Characters White or Off-white solid Complies
Water <0.5% 0.41%
Conclusion  Conforms 
Storage: keep in tight containers, in a cool and dry place, and away from light and moisture