ChEBI

Any minor or unwanted substance introduced into the environment that can have undesired effects.

Any substance that inhibits the synthesis of DNA.

An EC 1.17.* (oxidoreductase acting on CH or CH2) inhibitor that inhibits the action of ribonucleoside-diphosphate reductase (EC 1.17.4.1).

A xenobiotic (Greek, xenos "foreign"; bios "life") is a compound that is foreign to a living organism. Principal xenobiotics include: drugs, carcinogens and various compounds that have been introduced into the environment by artificial means.

A substance which is structurally similar to a metabolite but which competes with it or replaces it, and so prevents or reduces its normal utilization.

A substance used in the prophylaxis or therapy of virus diseases.

An agent that suppresses immune function by one of several mechanisms of action. Classical cytotoxic immunosuppressants act by inhibiting DNA synthesis. Others may act through activation of T-cells or by inhibiting the activation of helper cells. In addition, an immunosuppressive agent is a role played by a compound which is exhibited by a capability to diminish the extent and/or voracity of an immune response.

A chemical compound that can be excited by light of a specific wavelength and subsequently transfer energy to a chosen reactant. This is commonly molecular oxygen within a cancer tissue, which is converted to (highly rective) singlet state oxygen. This rapidly reacts with any nearby biomolecules, ultimately killing the cancer cells.

A drug that makes increases the sensitivity of tumour cells to radiation therapy.

A compound that, on administration, must undergo chemical conversion by metabolic processes before becoming the pharmacologically active drug for which it is a prodrug.

A substance that inhibits or prevents the proliferation of neoplasms.

A substance used in the prophylaxis or therapy of virus diseases.

An agent that suppresses immune function by one of several mechanisms of action. Classical cytotoxic immunosuppressants act by inhibiting DNA synthesis. Others may act through activation of T-cells or by inhibiting the activation of helper cells. In addition, an immunosuppressive agent is a role played by a compound which is exhibited by a capability to diminish the extent and/or voracity of an immune response.