code: def get_target_chemblid(target_upid):
      
      url = 'https://www.ebi.ac.uk/chembl/api/data/target.json'
      params = {'target_components__accession': target_upid}
      r = requests.get(url, params=params)
      r.raise_for_status()
      js = r.json()
      target_chemblid = js['targets'][0]['target_chembl_id']
      return target_chemblid
docs: Get ChEMBL ID from UniProt upid
  
      Parameters
      ----------
      target_upid : str
  
      Returns
      -------
      target_chembl_id : str