| http://www.w3.org/ns/prov#value | - ing 1 to 6 carbon atoms; Z represents a direct bond or ???N(R???)R??? in which R is an alkylene group having 1 to 20 carbon atoms and R??? is a hydrogen atom or an alkyl group having 1 to 6 carbon atoms; R1 and R2 each independently represent a divalent organic group; and R3 represents a residual group of an aliphatic, alicyclic or aromatic diisocyanate.
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