129316-97-8 27417-83-0 52136-88-6 Bis((4-aminobutyl)poly(oxy-1,4-butanediyl)) amine Poly(oxy-1,4-butanediyl), alpha-(4-aminobutyl)-omega-(4-aminobutoxy)- alpha-(4-Aminobutyl)-omega-(4-aminobutoxy)poly(oxy-1,4-butanediyl)