sucrose(out) + H(+)(out) <=> sucrose(in) + H(+)(in)
sucrose(out) + h(+)(out) <=> sucrose(in) + h(+)(in)
sucrose(out) + H(+)(out) <=> sucrose(in) + H(+)(in)
sucrose(out) + h(+)(out) <=> sucrose(in) + h(+)(in)