1,2,4-triazolo[4,3-a]pyrimidine-3(2H)-thione, 5,7-dimethyl-;1,2,4-Triazolo[4,3-a]pyrimidine-3-thiol, 5,7-dimethyl-;5,7-Dimethyl[1,2,4]triazolo[4,3-a]pyrimidine-3-thiol
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