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