| http://www.w3.org/ns/prov#value | - unsaturated hetereocyclic ring, wherein each ring consists of 3 to 7 members selected from the group consisting of carbon, nitrogen,oxygen and sulfur: Z is a displaceable leaving group and is the dehydro residue of the compound Z--H wherein the pKa of Z--H???Z- +H+ is the range of from 1.0 to 12.0; and n is an integer in the range of from 1 to 3, and (B) pharmaceutically acceptable salts thereof;
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