preferred_name: (S)-allantoin(out) + H(+)(out) => (S)-allantoin(in) + H(+)(in)
preferred_name_lc: (s)-allantoin(out) + h(+)(out) => (s)-allantoin(in) + h(+)(in)
label: (S)-allantoin(out) + H(+)(out) => (S)-allantoin(in) + H(+)(in)
label_lc: (s)-allantoin(out) + h(+)(out) => (s)-allantoin(in) + h(+)(in)