nicotinate(out) + a carboxylate(in) => nicotinate(in) + a carboxylate(out)
nicotinate(out) + a carboxylate(in) => nicotinate(in) + a carboxylate(out)
nicotinate(out) + a carboxylate(in) => nicotinate(in) + a carboxylate(out)
nicotinate(out) + a carboxylate(in) => nicotinate(in) + a carboxylate(out)