(3S,3aR,6aS)-hexahydrofuro[2,3-b]furan-3-yl {(1S,2R)-1-benzyl-3-[(3S,4aS,8aS)-3-[(tert-butylamino)carbonyl]octahydroisoquinolin-2(1H)-yl]-2-hydroxypropyl}carbamate AIDS-006336 AIDS006336 Ro 31-8959, bis-Thf deriv.