preferred_name: a 3'-end 2',3'-cyclophospho-uridine-RNA + uridine => a 3'-end uridylyl-uridine-RNA
preferred_name_lc: a 3'-end 2',3'-cyclophospho-uridine-rna + uridine => a 3'-end uridylyl-uridine-rna
label: a 3'-end 2',3'-cyclophospho-uridine-RNA + uridine => a 3'-end uridylyl-uridine-RNA
label_lc: a 3'-end 2',3'-cyclophospho-uridine-rna + uridine => a 3'-end uridylyl-uridine-rna