The 4-carboxyaldehyde form of vitamin B6 which is converted to pyridoxal phosphate which is a coenzyme for synthesis of amino acids neurotransmitters (serotonin norepinephrine) sphingolipids aminolevulinic acid.

Guanosine monophosphate also known as guanylic acid or 5'-GMP belongs to the class of organic compounds known as purine ribonucleoside monophosphates. In particular L-Glutamic acid and guanosine monophosphate can be biosynthesized from xanthylic acid and L-glutamine; which is catalyzed by the enzyme GMP synthase.

Neuromedin N is a neuropeptide derived from the same precursor polypeptide as neurotensin, and with similar but subtly distinct expression and effects.