1H-Purine-2,6-dione, 3,7-dihydro-8-((3-aminopropyl)thio)-1,3,7-trimethyl-, hydrochloride 56223-59-7 8-((3-Aminopropyl)thio)caffeine hydrochloride CAFFEINE, 8-((3-AMINOPROPYL)THIO)-, HYDROCHLORIDE