O-[S-4-(aminobutanoyl)pantetheine-4'-phosphoryl]serine zwitterionic residue
o-[s-4-(aminobutanoyl)pantetheine-4'-phosphoryl]serine zwitterionic residue
A zwitterionic group obtained by transfer of a proton from the phosphate to the amino group of <em>O</em>-[<em>S</em>-4-(aminobutanoyl)pantetheine-4'-phosphoryl]serine residue; major species at pH 7.3.