| http://www.w3.org/ns/prov#value | - gen, an alkyl group, an aryl group or an alkylcarbonyl group, or R5 and R6 may be coupled to each other to form a ring; R1, R2, R3 and R4 may also be coupled to each other to form a ring, and at least one of the groups represented by R1, R2, R3 and R4 and at least one of the groups represented by R5 and R6 may further be coupled to each other to form a ring; and each of n1, n2 and n3 is an integer
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