AIDS-181997 AIDS181997 Benzenepropanoic acid, .beta.-(benzoylamino)-.alpha.-hydroxy-, (4S,4aR)-1,3,4,4a,5,6,7,9-octahydro-6,6,8-trimethyl-1-oxoazuleno[5,6-c]furan-4-yl ester, (.alpha.R,.beta.S)-