1 S1S 2-(4-((9s,10s,14s,z)-18-(2-amino-2-oxoethyl)-9-(carboxymethyl)-14-(naphthalen-1-ylmethyl)-8,17,20-trioxo-7,16,19-triazaspiro[5.14]icos-11-en-10-yl)phenyl)malonic acid 1.000 2 ZLY (4-{(10r,11e,14s,18s)-18-(2-amino-2-oxoethyl)-14-[(naphthalen-1-yl)methyl]-8,17,20-trioxo-7,16,19-triazaspiro[5.14]icos-11-en-10-yl}phenyl)acetic acid 0.873 3 DTF 4-[(10s,14s,18s)-18-(2-amino-2-oxoethyl)-14-(1-naphthylmethyl)-8,17,20-trioxo-7,16,19-triazaspiro[5.14]icos-11-en-10-yl]benzylphosphonic acid 0.763