glycine betaine(out) + (R)-carnitine(in) => glycine betaine(in) + (R)-carnitine(out)
glycine betaine(out) + (r)-carnitine(in) => glycine betaine(in) + (r)-carnitine(out)
glycine betaine(out) + (R)-carnitine(in) => glycine betaine(in) + (R)-carnitine(out)
glycine betaine(out) + (r)-carnitine(in) => glycine betaine(in) + (r)-carnitine(out)