4OH-Coumarin deriv. AIDS-006499 AIDS006499 N-[(1,1-Dimethylethoxy)carbonyl]-N-[3-[1-(4-hydroxy-2-oxo-2H-1-benzopyran-3-yl)propyl]phenyl]alaninamide Phenprocoumon BocNHAlaNH deriv. U97410 analog