MFS-type transporter; part of the gene cluster that mediates the biosynthesis of heptelidic acid (HA), a sesquiterpene lactone that acts as an inhibitor of glyceraldehyde-3-phosphatedehydrogenase (GAPDH) and a growth inhibitor of the salt-tolerant lactic acid bacteria in soy sauce brewing (PubMed:30466366). Might be required for efficient secretion of heptelidic acid (Probable). Does not affect the biosynthesis of heptelidic acid. Belongs to the major facilitator superfamily.