chloramphenicol(out) + H(+)(in) => chloramphenicol(in) + H(+)(out)
chloramphenicol(out) + h(+)(in) => chloramphenicol(in) + h(+)(out)
chloramphenicol(out) + H(+)(in) => chloramphenicol(in) + H(+)(out)
chloramphenicol(out) + h(+)(in) => chloramphenicol(in) + h(+)(out)