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