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