(+-)-2-Amino-N1-(2-hydroxyethyl)butanediamide 70679-99-1 Butanediamide, 2-amino-N1-(2-hydroxyethyl)-, (+-)-, polymer with (+-)-2-amino-N4-(2-hydroxyethyl)butanediamide alpha,beta-Poly-(2-hydroxyethyl)-dl-aspartamide