... Department of Chemistry, Columbia University New York, New York 10027 Received October 12, 1982 ... 0 1983 American Chemical Societv ... pressure experiment (ref lo), Dr. M. Nakatani for some HPLC analyses, and Dr. W. B. Turner of IC1 for making available to us the spectra ...
![(3E,5R,9S,11E,12aS,15S,15aS,16S,18aR)-16-benzyl-5-((tert-butyldimethylsilyl)oxy)-9,14,15-trimethyl-6,7,8,9,10,12a,15,15a,16,17-decahydro-2H-[1]oxacyclotetradecino[2,3-d]isoindole-2,18(5H)-dione结构式](https://image.chemsrc.com/caspic/408/86527-62-0.png)
![(3E,5R,9S,11E,12aS,15S,15aS,16S,18aR)-17-acetyl-16-benzyl-5-((tert-butyldimethylsilyl)oxy)-9,14,15-trimethyl-6,7,8,9,10,12a,15,15a,16,17-decahydro-2H-[1]oxacyclotetradecino[2,3-d]isoindole-2,18(5H)-dione结构式](https://image.chemsrc.com/caspic/370/86527-63-1.png)
![(3S,3aS,4R,6aR,10S,14R,18aR,E)-3-benzyl-14-((tert-butyldimethylsilyl)oxy)-4,5,10-trimethyl-3,3a,4,6a,9,10,11,12,13,14,15,16-dodecahydro-1H-[1]oxacyclotetradecino[2,3-d]isoindole-1,17(2H)-dione结构式](https://image.chemsrc.com/caspic/218/86527-45-9.png)
![(3S,3aS,10S,14R,18aR,E)-2-acetyl-3-benzyl-14-((tert-butyldimethylsilyl)oxy)-4,5,10-trimethyl-3,3a,4,6a,9,10,11,12,13,14,15,16-dodecahydro-1H-[1]oxacyclotetradecino[2,3-d]isoindole-1,17(2H)-dione结构式](https://image.chemsrc.com/caspic/456/86527-61-9.png)
![(1E,4S,8R,9E,12aS,15S,15aS,16S,16aR,17aS,17bS)-14-acetyl-15-benzyl-8-((tert-butyldimethylsilyl)oxy)-4,16,16a-trimethyl-3,5,6,7,8,14,15,15a,16,16a,17a,17b-dodecahydro-11H-[1]oxacyclotetradecino[2,3-d]oxireno[2,3-f]isoindole-11,13(4H)-dione结构式](https://image.chemsrc.com/caspic/280/86542-46-3.png)