The molecule is the (S)-enantiomer of 3-(indol-3-yl)-2-oxobutyric acid. It is a conjugate acid of a (S)-3-(indol-3-yl)-2-oxobutyrate. It is an enantiomer of a (R)-3-(indol-3-yl)-2-oxobutyric acid.
(3S)-3-(1H-indol-3-yl)-2-oxobutanoic acid