(S)-lactate(in) + Na(+)(in) => (S)-lactate(out) + Na(+)(out)
(s)-lactate(in) + na(+)(in) => (s)-lactate(out) + na(+)(out)
(S)-lactate(in) + Na(+)(in) => (S)-lactate(out) + Na(+)(out)
(s)-lactate(in) + na(+)(in) => (s)-lactate(out) + na(+)(out)