If raw data with ADC master and slave concatenated is retrieved, a macro is available to get the conversion data of ADC master or ADC slave: see helper macro
__LL_ADC_MULTI_CONV_DATA_MASTER_SLAVE
(). (however this macro is mainly intended for multimode transfer by DMA, because this function can do the same by getting multimode conversion data of ADC master or ADC slave separately). CDR DATA2 LL_ADC_REG_ReadMultiConversionData32