A method of treating male erectile dysfunction comprising administering to a male human in need of such treatment an effective amount of a compound of formula : ##STR6## wherein R1 is methyl or ethyl {HEAD ~ R2} is {TAIL ~ ethyl} or n propyl 
is
A method of treating male erectile dysfunction comprising administering to a male human in need of such treatment an effective amount of a compound of formula : # # STR6 # # wherein R1 is methyl or ethyl { HEAD ~ R2 } is { TAIL ~ ethyl } or n propyl
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