AIDS-181999 AIDS181999 Benzenepropanoic acid, .beta.-(benzoylamino)-.alpha.-hydroxy-, (4S,4aR,7aS,8S)-8-ethoxy-4,4a,5,6,7,7a,8,9-octahydro-6,6,8-trimethylazuleno[5,6-c]furan-4-yl ester, (.alpha.R,.beta.S)-