1.Leucine 2.Assay: 98.5%-101.5% 3.Quality Standards: USP30 4.C.A.S # : 61- ... # : 61-90-5Molecular formula: C6H13NO2Molecular weight : 131.17Assay: 98.5%-101.5%Quality Standards: USP30Leucine contains not less than 98.5 ... percent and not more than 101.5 percent of C6H13NO2,as L-leucine,calculated on the ... be used by muscles as an energy source. 98.5%-101.5% Leucine