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