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  2. Pyrimidine - Wikipedia

    en.wikipedia.org/wiki/Pyrimidine

    Pyrimidine (C 4 H 4 N 2; / p ɪ ˈ r ɪ. m ɪ ˌ d iː n, p aɪ ˈ r ɪ. m ɪ ˌ d iː n /) is an aromatic, heterocyclic, organic compound similar to pyridine (C 5 H 5 N). [3] One of the three diazines (six-membered heterocyclics with two nitrogen atoms in the ring), it has nitrogen atoms at positions 1 and 3 in the ring.

  3. Purine - Wikipedia

    en.wikipedia.org/wiki/Purine

    Purine is a heterocyclic aromatic organic compound that consists of two rings (pyrimidine and imidazole) fused together. It is water-soluble. Purine also gives its name to the wider class of molecules, purines, which include substituted purines and their tautomers. They are the most widely occurring nitrogen-containing heterocycles in nature. [1]

  4. Category:Pyrimidines - Wikipedia

    en.wikipedia.org/wiki/Category:Pyrimidines

    Pyrimidines are organic compounds that contain the pyrimidine base structure. Subcategories. This category has the following 9 subcategories, out of 9 total. A.

  5. List of biomolecules - Wikipedia

    en.wikipedia.org/wiki/List_of_biomolecules

    For substances with an A- or α- prefix such as α-amylase, please see the parent page (in this case Amylase). A23187 (Calcimycin, Calcium Ionophore); Abamectine; Abietic acid

  6. Simple aromatic ring - Wikipedia

    en.wikipedia.org/wiki/Simple_aromatic_ring

    Many simple aromatic rings have trivial names. They are usually found as substructures of more complex molecules ("substituted aromatics"). Typical simple aromatic compounds are benzene, indole, and pyridine. [1] [2] Simple aromatic rings can be heterocyclic if they contain non-carbon ring atoms, for example, oxygen, nitrogen, or sulfur.

  7. Purine metabolism - Wikipedia

    en.wikipedia.org/wiki/Purine_metabolism

    It is not the committed step to purine synthesis because PRPP is also used in pyrimidine synthesis and salvage pathways. The first committed step is the reaction of PRPP, glutamine and water to 5'-phosphoribosylamine (PRA), glutamate , and pyrophosphate - catalyzed by amidophosphoribosyltransferase , which is activated by PRPP and inhibited by ...

  8. Uracil - Wikipedia

    en.wikipedia.org/wiki/Uracil

    Pyrimidine, like polycyclic aromatic hydrocarbons (PAHs), a carbon-rich chemical found in the Universe, may have been formed in red giants or in interstellar dust and gas clouds. [ 20 ] Based on 12 C/ 13 C isotopic ratios of organic compounds found in the Murchison meteorite , it is believed that uracil, xanthine , and related molecules can ...

  9. Pyrimidinedione - Wikipedia

    en.wikipedia.org/wiki/Pyrimidinedione

    Pyrimidine. Pyrimidinediones are ... Examples include naturally occurring metabolites: Trivial name IUPAC name Structure Pathway Uracil: Pyrimidine-2,4(1H,3H)-dione: