Synonyms: .beta.-Alanine, N-(2-aminoethyl)-, monosodium salt, polymer with 1,4-butanediol, 1,6-diisocyanatohexane, 1,3-diisocyanatomethylbenzene, 2,2-dimethyl-1,3-propanediol, hexanedioic acid and 1,6-hexanediol;-Alanine, N-(2-aminoethyl)-, monosodium salt, polymer with 1,4-butanediol, 1,6-diisocyanatohexane, 1,3-diisocyanatomethylbenzene, 2,2-dimethyl-1,3-propanediol, hexanedioic acid and 1,6-hexanediol