for the following products
tert-Butyl 3-amino-6,6-dimethyl-1H,4H,5H,6H-pyrrolo[3,4-c]pyrazole-5-carboxylate | tert-Butyl 3-amino-6,6-dimethyl-4,6-dihydropyrrolo[3,4-c]pyrazole-5(1H)-carboxylate and tert-Butyl 3-amino-6,6-dimethylpyrrolo[3,4-c]pyrazole-5(1H,4H,6H)-carboxylate
