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