1H-Purine-2,6-dione, 3,7-dihydro-1,3,7-trimethyl-, monohydrochloride (9CI) 3,7-Dihydro-1,3,7-trimethyl-1H-purine-2,6-dione monohydrochloride 5892-18-2 CAFFEINE HYDROCHLORIDE Caffeine monohydrochloride (8CI) Caffeine, hydrochloride EINECS 227-570-5