| C07D521/00 | Heterocyclic compounds containing unspecified hetero rings [2] |
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Note(s) This group is only used for the classification of heterocyclic compounds the chemical structure of which are not specified, i.e. only in those cases where the heterocyclic compounds cannot be classified in any of groups C07D 201/00-C07D 519/00.[2009.01] |
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