Acts as a membrane potential-dependent organic anion transporter, the transport requires a low concentration of chloride ions. May be involved in urate extrusion from the intestinal duct. May recognize hydrophilic anionic drugs such as aspirin, salicylate, and ibuprofen as substrates. Able to actively transport inorganic phosphate into cells via Na(+) cotransport (in vitro). Apical in the intestinal brush border. Abundantly expressed in pancreas, liver, colon and small intestine, less in kidney. Not detected in the adrenal glands, brain, placenta, heart, testis, skeletal muscle, and lungs. Belongs to the major facilitator superfamily. Sodium/anion cotransporter family.