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4,7-Bis(p-methylphenyl)-2,3,4a,5,6,7-hexahydro-5,5,6,6-tetracyano-4H-1,2,3-benzothiadiazine-2,3-dicarboxylic acid diethyl ester |
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3,8-Bis(p-methylphenyl)-1,2,3,5,8,8a-hexahydro-1,2-diaza-5-thianaphthalene-1,2,6,7-tetracarboxylic acid 1,2-diethyl 6,7-dimethyl ester |
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