The molecule is the amino acid zwitterion formed from 3,3',5-triiodo-L-thyronine by tranfer of a proton from the carboxy group to the amino group. It is the major species at pH 7.3. It has a role as a human metabolite. It is a tautomer of a 3,3',5-triiodo-L-thyronine.
(2S)-2-azaniumyl-3-[4-(4-hydroxy-3-iodophenoxy)-3,5-diiodophenyl]propanoate