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