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