| http://www.w3.org/ns/prov#value | - kyl, alkoxy carbonyl alkyl, aralkoxy carbonyl alkyl, formyl, acyl, acylalkyl, alkyl sulfonyl, or aralkyl sulfonyl; R and R' together may form a 5 to 7 atom ring which may include 0 to 2 hereto atoms of N, O or S; R1 is hydrogen or lower alkyl, provided at least one of R, R', R and R' is other than hydrogen; and the pharmaceutically acceptable salts thereof.8.
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