2-[[[3-[1-(4-Hydroxy-2-oxo-2H-1-benzopyran-3-yl)propyl]phenyl]amino]carbonyl-1-pyrrolidinecarboxylic acid, tert-butyl ester 4OH Coumarin deriv. AIDS-028328 AIDS028328 Phenprocoumon, BOC-Pyrrolyl deriv.