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