G5'ppp5'm(2')AACA-mRNA(6-)
g5'ppp5'm(2')aaca-mrna(6-)
A guanosine (G) linked via an inverted 5'-5' triphosphate bridge to an initiating 2'-<em>O</em>-methyl-AACA oligonucleotide. Major species at pH 7.3.