| abstract |
A phosphodiesterase inhibitor having high PDE inhibitory activity is provided. A phosphodiesterase inhibitor contains a 2- [2- (4-methoxyphenyl) ethyl] chromone derivative represented by the following chemical formula (1) as an active ingredient. However, R 0 , R 1 , R 2 , and R 3 in the following chemical formula (1) each independently represent a hydrogen atom, a hydroxy group, or an alkoxy group having 1 to 6 carbon atoms. [Chemical 1] [Selection figure] None |