text: .headers on
  .mode csv
  .output target_classes.csv
  
  
  SELECT target_dictionary.chembl_id, protein_family_classification.l1, protein_family_classification.l2, protein_family_classification.l3, target_dictionary.pref_name
  FROM target_dictionary INNER Join target_components
            ON target_dictionary.tid = target_components.tid
  INNER Join component_class
            ON target_components.component_id = component_class.component_id
  INNER Join protein_family_classification
        ON component_class.protein_class_id = protein_family_classification.protein_class_id
  WHERE target_dictionary.organism in ("Homo sapiens")
  and target_dictionary.target_type in ("SINGLE PROTEIN");
  