Cdk4 AND/OR Cdk6 INHIBITOR INCLUDING BIARYLUREA COMPOUND OR ITS SALT AS ACTIVE INGREDIENT

摘要

PROBLEM TO BE SOLVED: To provide a Cdk4 and/or Cdk6 inhibitor or the like that is aimed at treating malignant tumor. SOLUTION: This Cdk4 and/or Cdk6 inhibitor includes a compound represented by formula (I) [wherein, Ar is a N-including heteroaromatic; X and Z are each C or the like; Y is CO or the like; R1 is H or the like; R2 and R3 are each H or the like; R4 and R5 are each H or the like ; and a partial structure (...) represents a single or double bond] or its salt as an active ingredient.