4OH-Coumarin deriv. AIDS-006496 AIDS006496 N-[(1,1-Dimethylethoxy)carbonyl]-N-[3-[1-(4-hydroxy-2-oxo-2H-1-benzopyran-3-yl)cyclopropylmethylene].beta-alaninamide Phenprocoumon .b.AlaNH deriv. U97410 analog