| http://www.w3.org/ns/prov#value | - n is from 0 to 5; R1 is a protecting group selected from the group consisting of aralkyl, allyl, tertiary alkyl and methyl; and R2 is the same as R1, with the proviso that when R1 is methyl, R2 is not C1-C4 alkyl, or R2 is different from R1 and selected from the group consisting of alkyl, substituted alkyl, alkoxy, substituted alkoxy, aryl, substituted aryl, heteroaryl, substituted heteroaryl, cyc
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