1 5FP 5,5,5-trifluoro-3-hydroxy-4-[2-(5,5,5-trifluoro-3-hydroxy-4-{3-methyl-2-[3-methyl-2-(3-methyl-butyrylamino)-butyrylamino]-butyrylamino}-pentanoylamino)-propionylamino]-pentanoic acid 1.000 2 5FE 5,5,5-trifluoro-3-hydroxy-4-[2-(5,5,5-trifluoro-3-hydroxy-4-{3-methyl-2-[3-methyl-2-(3-methyl-butyrylamino)-butyrylamino]-butyrylamino}-pentanoylamino)-propionylamino]-pentanoic acid methyl ester 0.940