5'-(N(2),N(2),N(7)-trimethyl 5'-triphosphoguanosine)-(purine ribonucleotide)(2-) residue
5'-(n(2),n(2),n(7)-trimethyl 5'-triphosphoguanosine)-(purine ribonucleotide)(2-) residue
A 2,2,7-trimethyl guanosine (m(2,2,7)G) linked via an inverted 5'-5' triphosphate bridge to an initiating purine ribonucleotide; major microspecies at pH 7.3.