: A 2354 (OTTO) N-Acetyl-L-Tyrosine, 98% Cas 537-55-3 - used as a cell culture media component in the commercial biomanufacture of therapeutic recombinant proteins and monoclonal antibodies. N-Acetyl-L-tyrosine is an acetylated derivative of the essential amino acid L-tyrosine with reported improved nutritional properties.