preferred_name: a thymidine(6-4)thymidine in DNA = a thymidine dimer in DNA
preferred_name_lc: a thymidine(6-4)thymidine in dna = a thymidine dimer in dna
label: a thymidine(6-4)thymidine in DNA = a thymidine dimer in DNA
label_lc: a thymidine(6-4)thymidine in dna = a thymidine dimer in dna