| abstract |
A 2-aminoquinazoline derivative represented by formula (I) {wherein R 1 represents a hydrogen atom, or the like, R 2 represents a hydrogen atom, R 3 represents formula (II) [wherein A 1 represents formula (III), or the like, R 8 represents lower alkyl, or the like, and R 9 represents optionally substituted aryl, or the like], R 4 represents hydroxy, or the like, and R 5 represents optionally substituted aryl, or the like}, or a pharmaceutically acceptable salt thereof is provided. |