1 azido 2 (n tert butyloxycarbonyl)aminopropane 2 2 amino 1 azidopropane 2 Chiral monomer 2 L-alanine 2 L-alaninol 2 L-glutamic acid 2 Stereoregular polyamide 2 alanine derivative 2 alkane derivative 2 amide 2 aminopropanol 2 article 2 chirality 2 glutamic acid derivative 2 hydrogenolysis 2 hydrolysis 2 monomer 2 n (1' amino 2' propyl) 5 oxo 2 tetrahydrofuran carboxamide 2 n (1' azido 2' propyl) 5 oxo 2 tetrahydrofurancarboxyamide 2 n (1' hydroxy 2' propyl) 5 oxo 2 tetrahydrofurancarboxamide 2 pentachlorophenyl 5 oxo 2 tetrahydrofurancarboxylate 2 polymerization 2 synthesis 2 unclassified drug 2