| http://www.w3.org/ns/prov#value | - In one aspect, the present invention is a method for inducing or enhancing an erection in mammals comprising the administration of an effective amount of a compound of Formula I ##STR1## or a pharmaceutically acceptable salt thereof, wherein R1 and R2 are independently hydrogen, or a C1-8 alkyl, C2-8 alkenes, C3-8 cycloalkyls and isomeric forms thereof, to the penis of such mammal.
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