How to convert a RIC-list to ISINs?

I want to convert a list of RICs to ISINs. I tried with symbology:

import refinitiv.dataplatform as rdp

from refinitiv.dataplatform.content import symbology

sv_fields5 = ["TR.ISIN"]

sv_result5 = get_symbology(ric_liste, from_symbol_type="RIC", to_symbol_type="ISIN")

sv_result5.data.df


But I get the error "name 'get_symbology' is not defined".

What is wrong? Have I to install something else?

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