| http://www.w3.org/ns/prov#value | - (ii) R1 forms, together with the 2 nitrogen atoms and R2, R3, R5, and R6 in the formula, a group of the formula ##STR49## wherein R13 and R16 are, independently, a hydrogen atom or an alkyl group of 1 to 3 carbon atoms, R4 has the same meaning as above (i), and m is an integer of 5 to 500, wherein u is 1 or 2, R81, is a hydrogen atom; an alkyl group of 1 to 4 carbon atoms; an alkyl group of 1 to 4
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