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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:78601 term browser browse the term
Definition:A C21-steroid that is progesterone carrying two additional oxo substituents at positions 11 and 21
Synonyms:exact_synonym: 3,11,20-trioxopregn-4-en-21-al
 related_synonym: 4-pregnen-3,11,20-trione-21-al;   Formula=C21H26O4;   InChI=1S/C21H26O4/c1-20-8-7-13(23)9-12(20)3-4-14-15-5-6-16(18(25)11-22)21(15,2)10-17(24)19(14)20/h9,11,14-16,19H,3-8,10H2,1-2H3/t14-,15-,16+,19+,20-,21-/m0/s1;   InChIKey=GWUQLPRDKICNSB-KJQYFISQSA-N;   SMILES=C[C@]12CC(=O)[C@H]3[C@@H](CCC4=CC(=O)CC[C@]34C)[C@@H]1CC[C@@H]2C(=O)C=O;   pregn-4-ene-3,11,20,21-tetraone
 xref: Reaxys:3167679

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Term Annotations click to browse term
  CHEBI ontology 19781
    chemical entity 19781
      group 19699
        organic group 18620
          3-oxo-Delta(4)-steroid group 8416
            3-oxo-Delta(4) steroid 8416
              11,21-dioxoprogesterone 0
Path 2
Term Annotations click to browse term
  CHEBI ontology 19781
    subatomic particle 19779
      composite particle 19779
        hadron 19779
          baryon 19779
            nucleon 19779
              atomic nucleus 19779
                atom 19779
                  main group element atom 19669
                    p-block element atom 19669
                      carbon group element atom 19588
                        carbon atom 19578
                          organic molecular entity 19578
                            organic group 18620
                              organic divalent group 18611
                                organodiyl group 18611
                                  carbonyl group 18526
                                    carbonyl compound 18526
                                      carboxylic acid 18202
                                        carboacyl group 17418
                                          univalent carboacyl group 17418
                                            formyl group 8791
                                              aldehyde 8791
                                                steroid aldehyde 91
                                                  11,21-dioxoprogesterone 0
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