1,3,7-trimethyl-3,7-dihydro-1H-purine-2,6-dione 1H-purine-2,6-dione, 3,7-dihydro-1,3,7-trimethyl- 58-08-2 Coffein InChI=1/C8H10N4O2/c1-10-4-9-6-5(10)7(13)12(3)8(14)11(6)2/h4H,1-3H