2-Methyl-2-propanyl (4S)-4-{[N-({(1S,2S,6S,7R,10R,13S)-11-[3-(3-{[(3R)-4,4-dimethyl-2-oxotetrahydro-3-furanyl]oxy}-3-oxo-1-propen-1-yl)benzyl]-9-oxo-4,4-diphenyl-3,5,8,12-tetraoxa-11-azatetracyclo[5.5
.2.02,6.010,13]tetradec-13-yl}carbonyl)-D-threonyl]amino}-5-hydroxypentanoate