h. ( d. ) -atoms produced by photo-oxidation ( lambda = 254 nm ) of fe2+ in acidic glasses ( 6 mol dm-3 h2so4/h2o or d2so4/d2o ) at 77k were allowed to react with the purine bases adenine , guanine , hypoxanthine and xanthine as well as with ribo- and deoxyribosides ( -tides ) of adenine and guanine by annealing to 110-130 k .
C0034140
purine
C0001407
adenine