(S)-1-{(S)-2-[(S)-2-tert-Butoxycarbonylamino-3-(4-hydroxy-phenyl)-propionylamino]-4-methyl-pentanoyl}-pyrrolidine-2-carboxylic acid (1S,2R)-2-benzyloxy-1-benzyloxycarbonyl-propyl ester

(2S,3R)-2-((((11S,14S,17S,E)-6,11-bis((tert-butoxycarbonyl)amino)-14-(4-hydroxybenzyl)-17-isobutyl-2,2-dimethyl-4,12,15-trioxo-3-oxa-5,7,13,16-tetraazaoctadec-5-en-18-oyl)-L-prolyl)oxy)-3-hydroxybutanoic acid

(S)-1-{(S)-2-[(S)-2-tert-Butoxycarbonylamino-3-(4-hydroxy-phenyl)-propionyloxy]-4-methyl-pentanoyl}-pyrrolidine-2-carboxylic acid (1S,2R)-2-benzyloxy-1-benzyloxycarbonyl-propyl ester

(S)-1-{(S)-2-[(S)-2-Amino-3-(4-hydroxy-phenyl)-propionyloxy]-4-methyl-pentanoyl}-pyrrolidine-2-carboxylic acid (1S,2R)-2-benzyloxy-1-benzyloxycarbonyl-propyl ester

(S)-1-{(S)-2-[(S)-2-Amino-3-(4-hydroxy-phenyl)-propionylamino]-4-methyl-pentanoyl}-pyrrolidine-2-carboxylic acid (1S,2R)-2-benzyloxy-1-benzyloxycarbonyl-propyl ester