4OH-Coumarin deriv. AIDS-006334 AIDS006334 N-[(1,1-Dimethylethoxy)carbonyl]-N-[3-[1-(4-hydroxy-2-oxo-2H-1-benzopyran-3-yl)propyl]phenyl].beta.-alaninamide Phenprocoumon Boc-.b.AlaNH deriv. U97410 analog