2-[[[3-[Cyclopropyl(4-hydroxy-5,6,7,8,9,10-hexahydro-2-oxo-2H-cycloocta[b]pyran-3-yl)methyl]pheny]amino]carbonyl]-1-(S)-pyrrolidinecarboxylic acid, 1,1-dimethylethyl ester AIDS-043476 AIDS043476 Cyclooctapyranone deriv.