| http://www.w3.org/ns/prov#value | - oxy, C1???C6 alkoxycarbonyl, and benzyloxycarbonyl; or, (ii) is H and R2 is -x-(CH2)p???W wherein x is as defined above and p is as defined below and W is N-maleimide or V as defined below, or (iii) -y-C and R2 is x(CH2)p???W; or (iv) R1 and R2 together are a single bond;
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