indole-3-pyruvate + L-kynurenine <=> kynurenate + L-tryptophan + H2O
indole-3-pyruvate + l-kynurenine <=> kynurenate + l-tryptophan + h2o
indole-3-pyruvate + L-kynurenine <=> kynurenate + L-tryptophan + H2O
indole-3-pyruvate + l-kynurenine <=> kynurenate + l-tryptophan + h2o