compound, pharmaceutical composition, drug for the prevention or treatment of rheumatoid arthritis, atherosclerosis, pulmonary fibrosis, cerebral infarction, or cancer, and pyrido [3,4-d] pyrimidine derivative
The object of the present invention is to provide a compound which has excellent cdk4 / 6 inhibitory activity. The present invention is a compound represented by formula (I) or a pharmaceutically acceptable salt of the compound.o objetivo da presente invenção é prover um composto que tenha uma atividade inibidora de cdk4/6 excelente. a presente invenção é um composto representado pela fórmula (i) ou um sal farmaceuticamente aceitável do composto.