A method of treating male erectile dysfunction comprising administering to {TAIL ~ a male human} {HEAD ~ a pyrimidine compound} of formula I 
to
A method of treating male erectile dysfunction comprising administering to { TAIL ~ a male human } { HEAD ~ a pyrimidine compound } of formula I
OTH OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH