36963-54-9 6H-Furo[2',3':4,5]oxazolo[3,2-a]pyrimidine-2-methanol, 2,3,3a,9a-tetrahydro-3-hydroxy-6-imino-, monohydrofluoride, (2R-(2.alpha.,3.beta.,3a.beta.,9a.beta.))- NSC166623