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