2C4G:
reference: 3-Amino-1,4,5,6-tetrahydropyrrolo[3,4-c]pyrazoles: a new class of CDK2 inhibitors., Pevarello P, Fancelli D, Vulpetti A, Amici R, Villa M, Pittala V, Vianello P, Cameron A, Ciomei M, Mercurio C, Bischoff JR, Roletto F, Varasi M, Brasca MG, Bioorg Med Chem Lett. 2006 Feb 15;16(4):1084-90. Epub 2005 Nov 14. PMID: 16290148

This OCA Structure page
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