tert-Butyl 3-Amino-4,6-dihydropyrrolo[3,4-c]-pyrazole-5(1H)-carboxylatetert-Butyl 3-amino-4,6-dihydropyrrolo[3,4-c]pyrazole-5(1H)-carboxylate3-Amino-1,4,5,6-tetrahydropyrrolo[3,4-c]pyrazole, N5-BOC protected3-Amino-5-(tert-butoxycarbonyl)-1,4,5,6-tetrahydropyrrolo[3,4-c]pyrazoletert-Butyl 3-amino-4,6-dihydropyrrolo[3,4-c]pyrazole-5(1H)-carboxylate