dibromotyrosine dibromotyrosine dibromotyrosine is an antithyroid preparation and a derivative of the natural amino acid tyrosine. dibromotyrosineclinical dataatc codeh03bx02 (who) identifiers iupac name (2s)-2-amino-3-(3,5-dibromo-4-hydroxyphenyl)propanoic acid cas number300-38-9 ypubchem cid67532chemspider60854 nuniiqd49lep46echebichebi:28335 nchemblchembl1232132 necha infocard100.005.538 chemical and physical dataformulac9h9br2no3molar mass338.983 g·mol−13d model (jsmol)interactive image smiles brc1cc(cc(br)c1o)c(c(=o)o)n inchi inchi=1s/c9h9br2no3/c10-5-1-4(2-6(11)8(5)13)3-7(12)9(14)15/h1-2,7,13h,3,12h2,(h,14,15)/t7-/m0/s1 nkey:coeshzudrkcepa-zetcqymhsa-n n ny (what is this?) (verify) it is formed by eosinophil peroxidase.