| http://www.w3.org/ns/prov#value | - A compound as defined by claim 1, wherein:(a) at least one R is hydrogen; or (b) both R's are hydrogen; or (c) at least one R is an acyl group; or (d) both R's are acyl groups; or (e) at least one R is a carbonate group; or (f) both R's are carbonate groups. 3.
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