Kynurenine sulfate monohydrate is a precursor of kynurenic acid which is the only recognized endogenous excitatory amino acid receptor antagonist agent in the central nervous system. L-Kyn is known to be a pigment generating component in animals. In mamma
PF-04859989 is a brain-penetrable irreversible inhibitor of kynurenine amino transferase II. PF-04859989 is ~1000-fold selective for KAT II over human KAT I, KAT III, and KAT IV. PF-04859989 has IC50 values of 23 nM for hKAT II and 263 nM for rKAT II.