The invention relates to the use of a boron cluster compound as transmembrane carrier to transport a bioactive molecule across a membrane of a cell or vesicle. EP3928795A1; EP4171638A1; US2023293699A1; WO2021259668A1Research group: Granja / Montenegro / García-FandiñoIdentification: EP3928795A1WO2021259668A1US2023293699A1