| abstract |
A xanthine phosphodiesterase V inhibitor has the formula (I), wherein R 4 has a C 3-15 cycloalkyl group with or without one or more substituents, one or more substituents A C 3-15 cycloalkenyl group with or without, or a 3- to 15-membered heterocycloalkyl group with or without one or more substituents, the xanthine phosphodiesterase V inhibitor is male ( Erectile) and useful for treating female sexual dysfunction and other physiological disorders. For example, an exemplary compound of the invention is formula (II). |