The compounds of formula I are useful both in the free base form and in {HEAD ~ the form} of {TAIL ~ acid addition salts}, and, both forms are within the purview of the invention 
of
The compounds of formula I are useful both in the free base form and in { HEAD ~ the form } of { TAIL ~ acid addition salts } , and , both forms are within the purview of the invention
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH