The molecule is a 7-methyl guanosine (m7G) linked via an inverted 5'-5' triphosphate bridge to an guanosine ribonucleotide; major species at pH 7.3.
[[(2R,3S,4R,5R)-5-(2-amino-7-methyl-6-oxo-1H-purin-9-ium-9-yl)-3,4-dihydroxyoxolan-2-yl]methoxy-oxidophosphoryl] [[(2R,3S,4R,5R)-5-(2-amino-6-oxo-1H-purin-9-yl)-3,4-dihydroxyoxolan-2-yl]methoxy-oxidophosphoryl] phosphate