| http://www.w3.org/ns/prov#value | - an integer from 0 to 4 and wherein the 3- to 8-membered ring portion may optionally bear 1 to 4 C1 -C4 straight or branched alkyl substituents, or wherein R6 and R7 are combined such that --NR6 R7 represents the residue of a saturated monocyclic secondary amine; or R4 is a radical of the formula ##STR8## wherein z is an integer from 0 to 3; the acid additions salts of the compounds of formula (I)
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