4-[[(1,1-Dimethylethoxy)carbonyl]amino]-N-[3-[1-(4-hydroxy-2-oxo-2H-1-benzopyran-3-yl)propyl]phenyl]butanamide 4OH-Coumarin deriv. AIDS-006320 AIDS006320 Phenprocoumon PrCONH deriv. U97410 analog