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The Chemical Entities of Biological Interest (ChEBI) ontology is downloaded weekly from EMBL-EBI at The data is made available under the Creative Commons License (CC BY 3.0, For more information see: Degtyarenko et al. (2008) ChEBI: a database and ontology for chemical entities of biological interest. Nucleic Acids Res. 36, D344–D350.

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Accession:CHEBI:36597 term browser browse the term
Definition:An azaarene that is the 2,3-diaza analogue of naphthalene. The parent of the class of phthalazines.
Synonyms:related_synonym: 2,3-benzodiazine;   2,3-diazanaphthalene;   Formula=C8H6N2;   InChI=1S/C8H6N2/c1-2-4-8-6-10-9-5-7(8)3-1/h1-6H;   InChIKey=LFSXCDWNBUNEEM-UHFFFAOYSA-N;   SMILES=c1ccc2cnncc2c1;   benzo[d]pyridazine;   benzopyridazine;   beta-phenodiazine
 xref: Beilstein:109240;   CAS:253-52-1;   Gmelin:218064
 xref_mesh: MESH:C043388
 xref: PMID:21169055;   PMID:21940905;   Reaxys:109240;   Wikipedia:Phthalazine

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phthalazine term browser
Symbol Object Name Qualifiers Evidence Notes Source PubMed Reference(s) RGD Reference(s) Position
G Tnf tumor necrosis factor multiple interactions EXP phthalazine analog inhibits the reaction [Lipopolysaccharides results in increased expression of TNF protein] CTD PMID:18817365 NCBI chr20:5,189,382...5,192,000
Ensembl chr20:5,189,390...5,192,000
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Term paths to the root
Path 1
Term Annotations click to browse term
  CHEBI ontology 19816
    chemical entity 19816
      molecular entity 19814
        mancude ring 8120
          organic mancude parent 8120
            mancude organic heterocyclic parent 8120
              mancude organic heterobicyclic parent 5198
                phthalazine 1
Path 2
Term Annotations click to browse term
  CHEBI ontology 19816
    subatomic particle 19814
      composite particle 19814
        hadron 19814
          baryon 19814
            nucleon 19814
              atomic nucleus 19814
                atom 19814
                  main group element atom 19702
                    p-block element atom 19702
                      carbon group element atom 19608
                        carbon atom 19597
                          organic molecular entity 19597
                            organic molecule 19522
                              organic cyclic compound 19320
                                organic heterocyclic compound 18432
                                  organic heteropolycyclic compound 17844
                                    organic heterobicyclic compound 16765
                                      mancude organic heterobicyclic parent 5198
                                        phthalazine 1
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RGD is funded by grant HL64541 from the National Heart, Lung, and Blood Institute on behalf of the NIH.