| http://www.w3.org/ns/prov#value | - wherein R2 is a hydrogen atom or --(CH2)p --NH2 wherein p is an integer of from 0 to 5, R3 is a monovalent organic group having 1 to 10 carbon atoms, and letters a and b are numbers satisfying 0.001???a???1, 1???b???3, and 1.001???a+b???3.
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