AIDS-153842 AIDS153842 {(2R,3S)-3-[(3R,3aS,6aR)-(Hexahydro-furo[2,3-b]furan-3-yl)oxycarbonylamino]-2-hydroxy-4-phenyl-butyl}-(2-methyl-pent-4-enyl)-carbamic acid, non-8-enyl ester