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