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5-Boc-1-(methylsulfonyl)-1,4,5,6-tetrahydropyrrolo[3,4-c]pyrazole tert-Butyl 1-methylsulfonyl-4,6-dihydropyrrolo[3,4-c]pyrazole-5-carboxylate tert-butyl 1-(methylsulfonyl)-4,6-dihydropyrrolo[3,4-c]pyrazole-5(1H)-carboxylate tert-butyl 1-(methylsulfonyl)-4,6-dihydropyrrolo[3,4-c]pyrazole-5(1H)-carboxylate（WS203617） Pyrrolo[3,4-c]pyrazole-5(1H)-carboxylic acid, 4,6-dihydro-1-(methylsulfonyl)-, 1,1-dimethylethyl ester