3-氧雜-1-氮雜二環[3.2.0]庚烷-2,4-二酮,(5R)- Cyclohexanemethanamine,5-amino-1,3,3-trimethyl-,polymerwith2,4-diisocyanato-1-methylbenzene,.alpha.-hydro-.omega.-hydroxypolyoxy(methyl-1,2-ethanediyl),5-isocyanato-1-(isocyanatomethyl)-1,3,3-trimethylcyclohexaneand1,1-methylenebis4-isocyanatobenz

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