preferred_name: rifampicin(out) + H(+)(in) => rifampicin(in) + H(+)(out)
preferred_name_lc: rifampicin(out) + h(+)(in) => rifampicin(in) + h(+)(out)
label: rifampicin(out) + H(+)(in) => rifampicin(in) + H(+)(out)
label_lc: rifampicin(out) + h(+)(in) => rifampicin(in) + h(+)(out)