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