635-39-2 6H-Purin-6-one, 2-amino-1,7-dihydro-, monohydrochloride Guanine hydrochloride Guanine, hydrochloride Guanine, monohydrochloride NSC3702 Usaf S-1 WLN: T56 BM DN FMYMVJ GUM &GH