Biotin LC hydrazide (BACH) is a modification reagent of long-chain protein. Biotin LC hydrazide transforms periodate-oxidized glycoproteins and can be used to target glycoproteins and glycans.

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N-Acetyl-L-phenylalanine is an essential amino acid produced for medical feed and nutritional applications. It appears in large amount in urine of patients with phenylketonuria which is a human genetic disorder due to the lack of phenylalanine hydroxylase the enzyme necessary to metabolize phenylalanine to tyrosine.