pp5'N(3'ppp5'N)n
pp5'n(3'ppp5'n)n
An oligonucleotide comprised of a 5'-diphosphonucleotide connected via a (3'→5') triphosphate-linkage to a chain of (3'→5') triphosphate-linked ribonucleotide residues. The number of nucleotide residues in the chain is between 1 and 8.