| http://www.w3.org/ns/prov#value | - m and n are each an integer of 0 to 6, the average value of m+n is 1 to 6, preferably 2 to 6, when R7 and R8 are both a methyl group and 1 to 3 when R7 and R8 are both a hydrogen atom. wherein R13 and R14 are each independently a hydrogen atom or methyl group, R15 is a hydrogen atom, methyl group or ethyl group, and r is an integer of 1 to 10, with the proviso that r is an integer of 1 to 10, pref
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