(2R,4S)-4-Amino-2-hydroxy-2,6-dimethyl-3-oxoheptyl Acetate Trifluoroacetic Acid Salt is an intermediate for the synthesis of Carfilzomib (2R,4S)-Diol (C183470), which is a derivative of Carflizomib (C183460), a second-generation proteasome inhibitor that is used as a treatment in relapsed and refractory multiple myeloma.