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Guanine application includes colorants for drugs, textiles, personal care products etc.


Harmine is a fluorescent harmala alkaloid belonging to the beta-carboline family of compounds. It occurs in a number of different plants, most notably the Middle Eastern plant harmal or Syrian rue and the South American vine Banisteriopsis caapi. It is a RIMA, a reversible inhibitor of monoamine oxidase A (MAO-A), an enzyme which breaks down monoamines. It selectively binds to MAO-A but does not inhibit the variant MAO-B. MAOIs have been used to treat depression since they inhibit the breakdown of serotonin and norepinephrine, two neurotransmitters that have a role in the pathophysiology of clinical depression, suggesting that harmine may have antidepressant effect. It is a useful fluorescent pH indicator. As the pH of its local environment increases, the fluorescence emission of harmine decreases. With the radioisotope carbon-11 harmine is used in positron emission tomography neuroimaging to examine its binding to MAO-A. Harmine found in root secretions of Oxalis tuberosa has been found to have insecticidal properties.

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Hassium is a synthetic element. It is the heaviest member of the group 8 elements. It was first synthesized in 1984 by a German research team led by Peter Armbruster and Gottfried Münzenberg at the Institute for Heavy Ion Research in Darmstadt.

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Hygrine is a pyrrolidine alkaloid, found mainly in coca leaves. It was first isolated by Carl Liebermann in 1889 as an alkaloid accompanying cocaine in coca.


Immepip is a histamine agonist.


Iridium is a chemical element with the symbol Ir and atomic number 77. A very hard, brittle, silvery-white transition metal of the platinum group, iridium is the second-densest metal (after osmium) as defined by experimental X-ray crystallography.


Irilone is an isoflavone, a type of flavonoid. It can be found in Trifolium pratense and in Iris germanica.

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