ribonucleotidyl-uridine-RNA <=> a 5'-end dephospho-uridine-RNA + a 3'-end 2',3'-cyclophospho-ribonucleotide-RNA
ribonucleotidyl-uridine-rna <=> a 5'-end dephospho-uridine-rna + a 3'-end 2',3'-cyclophospho-ribonucleotide-rna