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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.

Term:methylene group
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Accession:CHEBI:50728 term browser browse the term
Synonyms:related_synonym: CH2;   Formula=CH2;   Methylen;   Methylengruppe;   SMILES=*C*;   methanediyl;   methano;   methylene;   metileno;   one carbon unit
 alt_id: CHEBI:29359;   CHEBI:48800;   CHEBI:52580

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Term paths to the root
Path 1
Term Annotations click to browse term
  CHEBI ontology 19823
    role 19773
      chemical role 19341
        greenhouse gas 10999
          methane 9996
            methylene group 0
Path 2
Term Annotations click to browse term
  CHEBI ontology 19823
    subatomic particle 19821
      composite particle 19821
        hadron 19821
          baryon 19821
            nucleon 19821
              atomic nucleus 19821
                atom 19821
                  main group element atom 19720
                    main group molecular entity 19720
                      s-block molecular entity 19502
                        hydrogen molecular entity 19495
                          hydrides 18855
                            organic hydride 18361
                              organic fundamental parent 18361
                                hydrocarbon 18074
                                  alkane 13746
                                    methane 9996
                                      methylene group 0
paths to the root