1H-Purinium, 2-(dimethylamino)-6,9-dihydro-7-methyl-6-oxo-9-beta-D-ribofuranosyl- 2-(Dimethylamino)-6,9-dihydro-7-methyl-6-oxo-9-beta-D-ribofuranosyl-1H-purinium 40027-70-1 N(2),N(2),7-trimethylguanosine