oxalate(out) + chloride(in) => oxalate(in) + chloride(out)
oxalate(out) + chloride(in) => oxalate(in) + chloride(out)
oxalate(out) + chloride(in) => oxalate(in) + chloride(out)
oxalate(out) + chloride(in) => oxalate(in) + chloride(out)