| abstract |
PROBLEM TO BE SOLVED: To provide a cGMP-specific PDE inhibitor. A 2 -phenyl substituted imidazotriazinone compound of formula A2 having improved non-specific binding and pharmaceutical properties, or a pharmaceutically acceptable salt, stereoisomer, or water thereof Japanese products. (In the formula, R 4 represents a chain or cyclic amino group which may have a substituent.) [Selection figure] None |