AIDS-153856 AIDS153856 [(1S,2R)-1-Benzyl-2-hydroxy-3-(5-methyl-2-oxo-1-oxa-3-aza-cyclopentadec-3-yl)-propyl]-carbamic acid, (3R,3aS,6aR)-(hexahydro-furo[2,3-b]furan-3-yl) ester