申请人:Teijin Pharma Limited
公开号:US20210276997A1
公开(公告)日:2021-09-09
Provided is a crystal of a novel pyrido[3, 4-d]pyrimidine derivative having excellent CDK 4/6 inhibitory activity. A crystal of a compound represented by formula (I). In the formula, R
1
represents a hydrogen atom or a C
1-3
alkyl group; R
2
represents a hydrogen atom or an oxo group; L represents a single bond or a C
1-3
alkylene group; and X represents CH or N.
提供的是一种具有出色的CDK 4/6抑制活性的新型吡啶并[3,4-d]嘧啶衍生物的晶体。该晶体代表的化合物的结构式为(I)。在该结构式中,R1代表氢原子或C1-3烷基基团;R2代表氢原子或氧基团;L代表单键或C1-3烷基烷基团;X代表CH或N。