| abstract |
Formula (I) {wherein R 1 represents a hydrogen atom, R 2 represents a hydrogen atom, R 3 represents a formula (II) [wherein A 1 represents a formula (III), etc. 8 represents lower alkyl or the like, R 9 represents aryl or the like which may have a substituent], R 4 represents hydroxy or the like, and R 5 may have a substituent. A 2-aminoquinazoline derivative represented by the following formula: or a pharmaceutically acceptable salt thereof. |