| http://www.w3.org/ns/prov#value | - In a preferred embodiment of the invention, R4 in formula A is hydrogen, R5 is a direct bond, R6 is hydrogen and R7 is CH2 OH, a hydrocarbon moiety or an organic moiety containing ester or ether groups and containing from 1 to about 20 carbon atoms, more preferably from about 3 to 20 carbon atoms.
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