| http://www.w3.org/ns/prov#value | - wherein R1, which may be the same or different, is a hydrogen atom or a monovalent organic group having 1 to 18 carbon atoms, R2, which may be the same or different, is a hydrogen atom or a monovalent organic group having 1 to 4 carbon atoms, and letters p and q are numbers in the range: 0.7???p???1.6, 0<q<3.3, and 0.7<p+q<4.
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