2,2'-Anhydro-4'-thio-1-beta-D-arabinofuranosylcytosine 52749-52-7 6H-Thieno(2',3':4,5)oxazolo(3,2-a)pyrimidine-2-methanol, 2,3,3a,9a-tetrahydro-3-hydroxy-6-imino-, monohydrochloride, (2R-(2alpha,3beta,3abeta,9abeta))-