4OH-Coumarin deriv. AIDS-006494 AIDS006494 N'-[(1,1-Dimethylethoxy)carbonyl]-N-[3-[1-(4-hydroxy-7-methoxy-2-oxo-2H-1-benzopyran-3-yl)propyl]phenyl].beta-alaninanamide Phenprocoumon b.AlaNH deriv. U97410 analog