(4S)-4-Amino-2,6-dimethyl-1-hepten-3-one 2,2,2-Trifluoroacetate is a reagent used for carbonyls and epoxides as dual electrophiles in peptide-based proteasome inhibitors. This is also an impurity of carfilzomib (C183460), which is a second-generation proteasome inhibitor that is used as a treatment in relapsed and refractory multiple myeloma. Molecular Formula: C11H18F3NO3 Molecular Weight: 269.26