(5S,15S)-5,15-BIS[(TERT-BUTYLOXY)CARBONYL]-10-[(5S)-6-(TERT-BUTYLOXY)-6-OXO-5-[[(BENZYLOXY)CARBONYL]AMINO]HEXYL]-8,12-DIHYDROXY-3-OXO-1-PHENYL-2-OXA-4,10,16-TRIAZAHEPTADECAN-17-OIC ACID BENZYL ESTER