preferred_name: a thymidine dimer in DNA => cyclobutadithymidine in DNA
preferred_name_lc: a thymidine dimer in dna => cyclobutadithymidine in dna
label: a thymidine dimer in DNA => cyclobutadithymidine in DNA
label_lc: a thymidine dimer in dna => cyclobutadithymidine in dna