| http://www.w3.org/ns/prov#value | - may be the same or different and are allowed to be substitued, and at least one of those groups represented by R1, R2, R3 and R4 is a group containing a double bond, a halogen atom, an epoxy group, an acid anhydride residue, an alkoxy group, an alkoxycarbonyl group, an amino group, an acryloyl group, a methacryloyl group, an acrylamido group, a methacrylamido group or a haloacylamino group; n1, n2
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