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