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