C[C:2]1[C:3](=[CH:7][C:8](=[CH:12][CH:13]=1)[N:9]=[C:10]=[O:11])[N:4]=[C:5]=[O:6].[C:14]([O-])(=O)CCCCCCCCCCC.C([O-])(=O)CCCCCCCCCCC.C([Sn+2]CCCC)CCC>C(C(CCCC)CO)C>[CH3:14][C:7]1[C:3]([N:4]=[C:5]=[O:6])=[CH:2][CH:13]=[CH:12][C:8]=1[N:9]=[C:10]=[O:11]In another reactor, a fully blocked diurethane of 80/20 2,4/2,6-toluene diisocyanate mixture was prepared by slowly adding 87.1 parts of 80/20 toluene diisocyanate to 142 parts of 2-ethylhexanol containing 1 drop of dibutyl tin dilaurate with external cooling to maintain the reaction mixture below 100°C.
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