| http://www.w3.org/ns/prov#value | - ino or O, and X7 is alkyl, alkoxy, aryloxy, or X7 can be H only if X6 is O, or R3 is a bond to an adjacent monomeric unit or directly or through an intermediate group a solid support,with the proviso that at least one of R1 and R3 is a bond. 17.
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