Chemistry is the experimental and theoretical study of materials on their properties at both the macroscopic and microscopic levels.In a patent， Safety of 4-Amino-2,2,6,6-tetramethylpiperidine, Which mentioned a new discovery about 36768-62-4
The present invention relates to 1 H-pyrazolo[3,4-b]pyridine compounds of the formula (I) in which R 1, R2, R3 and R4 are defined as indicated below. The compounds of the formula I are protein kinase C (PKC) inhibitors, and are useful for the treatment of diseases associated with diabetes and diabetic complications, such as, diabetic nephropathy, diabetic neuropathy and diabetic retinopathy, for example. The invention furthermore relates to the use of compounds of the formula, in particular as active ingredients in pharmaceuticals, and pharmaceutical compositions comprising them.
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Reference：
Piperidine – Wikipedia,
Piperidine | C5H8631N – PubChem