(2R)-N-({(2S,3S)-2-Hydroxy-4-phenyl-3-[(1,3-thiazol-5-ylmethoxy)carbonylamino]butyl}(3-furylmethyl)amino)-3-methyl-2-[(methyl{[2-(methylethyl)(1,3-oxazol-4-yl)]methyl}amino)carbonylamino]butanamide ABT-538, aza-Val deriv. AIDS-043481 AIDS043481