68225-48-9 Poly(oxy-1,4-butanediyl), alpha-(((4(or 6)-methyl-3-(((((1-methylpropylidene)amino)oxy)carbonyl)amino)phenyl)amino)carbonyl)-omega-((((4(or 6)-methyl-3-(((((1-methylpropylidene)amino)oxy)carbonyl)amino)phenyl)amino)carbonyl)oxy)-