Getting CUSIP/ISIN for stock RIC code

Hi Team,

I have a list of RIC codes and I'm trying to get the corresponding CUSIP/ISIN and the dates for which the mapping is valid using RTH Python. I use the following code, but the CUSIP field always returns a null value. Not sure about the corresponding field for the Bloomberg ticker.

instrument_list = [{'Identifier': '3412583.XD', 'IdentifierType': 'Ric'},
                   {'Identifier': 'A.N', 'IdentifierType': 'Ric'},
                   {'Identifier': 'AA.N', 'IdentifierType': 'Ric'},
                   {'Identifier': 'AAL.N', 'IdentifierType': 'Ric'},
                   {'Identifier': 'AAL.OQ', 'IdentifierType': 'Ric'}]

requestBody = {
 'ExtractionRequest': {
   '@odata.type': '#DataScope.Select.Api.Extractions.ExtractionRequests.HistoricalReferenceExtractionRequest',
   'ContentFieldNames': [ "Company Name", "Currency Code", "CUSIP", "ISIN", "Start date", "Change Date",],
   'IdentifierList': {
     '@odata.type': '#DataScope.Select.Api.Extractions.ExtractionRequests.InstrumentIdentifierList',  
     'InstrumentIdentifiers':  instrument_list,
        'ValidationOptions': {'AllowHistoricalInstruments': 'true', 'AllowInactiveInstruments' : 'true'},
        "UseUserPreferencesForValidationOptions": 'false'
   },
    "Condition": {"ReportDateRangeType": "Range", "QueryStartDate": "2010-01-01", "QueryEndDate": "2015-09-09"}
 } 
}

requestUrl = 'https://selectapi.datascope.refinitiv.com/RestApi/v1/Extractions/ExtractWithNotes';

requestHeaders_extraction = {
   'Prefer':'respond-async',
   'Content-Type':'application/json',
   'Authorization': 'token ' + auth_token
}

extraction_response = requests.post(requestUrl, json = requestBody, headers = requestHeaders_extraction)

can you please help me with the correct 'ContentFieldNames'/quert?

Thanks.