carnitine:O-acyl-L-carnitine antiporter activity fatty acyl carnitine carrier Catalysis of the reaction: carnitine (mitochondrial) + O-acyl-L-carnitine (cytoplasm) = carnitine (cytoplasm) + O-acyl-L-carnitine (mitochondrial). molecular_function Reactome:R-HSA-200424 Reactome:R-HSA-9971094 GO:0005476 carnitine:acyl carnitine carrier activity carnitine/acyl carnitine carrier activity carnitine transmembrane transporter activity O-acyl-L-carnitine transmembrane transporter activity antiporter activity