P-cymene is a monoterpene that is?toluene?substituted by an isopropyl group at position 4. It has a role as a plant metabolite a volatile oil component and a human urinary metabolite. It is a member of toluenes and a monoterpene.

2′,2′-Difluorodeoxyuridine (dFdU), the major metabolite of Gemcitabine, exhibits anticancer and antitumor activities, shows radiosensitization under hypoxic conditions, and can be used to study pancreatic cancer.

L-Cysteine hydrochloride hydrate is a conditionally essential amino acid, which acts as a precursor for biologically active molecules such as hydrogen sulphide (H2S), glutathione and taurine.