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