| http://www.w3.org/ns/prov#value | - rosslinked with other Y5 or X4, q is an integer of 1 to 5 and represents [(valency of M3)???2], r is an integer of 0 to 3, each of R21 to R30 denotes a hydrogen atom, a halogen atom, a hydrocarbon group having 1 to 20 carbon atom(s), a silicon-containing group and a heteroatom-containing group, and M3 denotes a metal element of Group 3 to Group 10 or of lanthanoids in the periodic table.
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