preferred_name: a cytidine(6-4)cytidine in DNA <=> a cytidine dimer in DNA + H(+)
preferred_name_lc: a cytidine(6-4)cytidine in dna <=> a cytidine dimer in dna + h(+)
label: a cytidine(6-4)cytidine in DNA <=> a cytidine dimer in DNA + H(+)
label_lc: a cytidine(6-4)cytidine in dna <=> a cytidine dimer in dna + h(+)