preferred_name: a ribonucleotidyl-ribonucleotide-RNA => a 3'-end 2',3'-cyclophospho-ribonucleotide-RNA + a 5'-end dephospho-ribonucleoside-RNA
preferred_name_lc: a ribonucleotidyl-ribonucleotide-rna => a 3'-end 2',3'-cyclophospho-ribonucleotide-rna + a 5'-end dephospho-ribonucleoside-rna
label: a ribonucleotidyl-ribonucleotide-RNA => a 3'-end 2',3'-cyclophospho-ribonucleotide-RNA + a 5'-end dephospho-ribonucleoside-RNA
label_lc: a ribonucleotidyl-ribonucleotide-rna => a 3'-end 2',3'-cyclophospho-ribonucleotide-rna + a 5'-end dephospho-ribonucleoside-rna