Succinate and crystal form thereof as therapeutics

Abstract

Disclosed are salts of N-Cyclopentyl-5-(2-((5-((4-ethylpiperazin-1-yl)methyl)pyridin-2-yl)amino)-5-fluoropyrimidin-4-yl)-4-methylthiazol-2-amine and polymorphs thereof, which are inhibitors of protein kinases, in particular cyclin-dependent kinase 4/6 (CDK4/6), and can be used to treat proliferative disorders, such as cancer, and other diseases related to protein kinase/CDK activity. The disclosure includes the succinate salt of N-cyclopentyl-5-(2-((5-((4-ethylpiperazin-1-yl)methyl)pyridin-2-yl)amino)-5-fluoropyrimidin-4-yl)-4-methylthiazol-2-amine, Crystal Form A of the succinate salt, a pharmaceutical formulation comprising the succinate salt, and use of the succinate salt to treat the proliferative disorders.

Dependencies are inferred from the claim text.