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