1 REY Glycyl-L-alpha-amino-epsilon-pimelyl-D-alanine 1.000 2 REX Glycyl-L-alpha-amino-epsilon-pimelyl-D-alanyl-D-alanine 0.741 3 REZ (2r)-2-amino-7-{[(1r)-1-carboxyethyl]amino}-7-oxoheptanoic acid 0.727 4 RE1 Glycyl-L-a-aminopimelyl-E-(D-2-aminoethyl)phosphonate 0.720 5 HX9 (2~{R},6~{S})-2,6-diacetamido-7-[[(2~{R})-1-(oxidanylamino)-1-oxidanylidene-propan-2-yl]amino]-7-oxidanylidene-heptanoic acid 0.704