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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:34749 term browser browse the term
Definition:A 17beta-hydroxy steroid that is testosterone in which the 17beta hydrogen is replaced by an ethynyl group. Ethisterone was the first orally active progestin and is a metabolite of danazol.
Synonyms:exact_synonym: (17alpha)-17-hydroxypregn-4-en-20-yn-3-one
 related_synonym: 17-beta-hydroxy-17-alpha-ethynyl-4-androsten-3-one;   17-ethynyl-17beta-hydroxyandrost-4-en-3-one;   17-hydroxy-17alpha-pregn-4-en-20-yn-3-one;   17alpha-ethinyltestosterone;   17alpha-ethynyl-17beta-hydroxyandrost-4-en-3-one;   17alpha-ethynyltestosterone;   Formula=C21H28O2;   InChI=1S/C21H28O2/c1-4-21(23)12-9-18-16-6-5-14-13-15(22)7-10-19(14,2)17(16)8-11-20(18,21)3/h1,13,16-18,23H,5-12H2,2-3H3/t16-,17+,18+,19+,20+,21+/m1/s1;   InChIKey=CHNXZKVNWQUJIB-CEGNMAFCSA-N;   Lutocylol;   Nugestoral;   Ora-Lutin;   Pranone;   Prodroxan;   Produxan;   Progestab;   Progestoral;   SMILES=C[C@]12CC[C@H]3[C@@H](CCC4=CC(=O)CC[C@]34C)[C@@H]1CC[C@@]2(O)C#C;   Syngestrotabs;   Trosinone;   aethisteron;   aethisteronum;   anhydrohydroxyprogesterone;   anhydroxyprogesterone;   ethisteronum;   ethynyltestosterone;   etisterona
 xref: CAS:434-03-7;   Drug_Central:1084;   HMDB:HMDB0060580;   KEGG:C14487;   PMID:13494335;   PMID:374128;   PMID:8327560;   Reaxys:1889895;   Wikipedia:Ethisterone

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Path 1
Term Annotations click to browse term
  CHEBI ontology 19816
    chemical entity 19816
      group 19728
        organic group 18537
          3-oxo-Delta(4)-steroid group 7939
            3-oxo-Delta(4) steroid 7939
              ethisterone 0
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 group 18537
                              organic divalent group 18530
                                organodiyl group 18530
                                  carbonyl group 18436
                                    carbonyl compound 18436
                                      ketone 16173
                                        oxo steroid 9283
                                          3-oxo steroid 8811
                                            3-oxo-Delta(4) steroid 7939
                                              testosterone 2846
                                                ethisterone 0
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