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Omarigliptin Impurity 9 tert-butyl pyrrolo[3,4-c]pyrazole-5(2H,4H,6H)-carboxylate tert-butyl 2,6-dihydropyrrolo[3,4-c]pyrazole-5(4H)-carboxylate tert-butyl 4,6-dihydro-2H-pyrrolo[3,4-c]pyrazole-5-carboxylate tert-butyl 4,6-dihy dropyrrolo[3,4-c]pyrazole-5(2H)-carboxylate 2,6-Dihydro-4H-pyrrolo[3,4-c]pyrazole-5-carboxylic acid tert-butyl ester 2,6-Dihydropyrrolo[3,4-c]pyrazole-5(4H)-carboxylic acid 1,1-dimethylethyl ester Pyrrolo[3,4-c]pyrazole-5(4H)-carboxylic acid, 2,6-dihydro-, 1,1-dimethylethyl ester