Purify the riboside by suspending the dry solid (~12 g) in hot MeOH (130 mL) and then adding enough hot H2O (~560mL) to cause solution, filter and set aside at 5o overnight. The colourless crystals of the riboside are filtered off, washed with Me2CO, Et2O and dried at 60o/0.1mm. More material can be obtained by evaporating the filtrate to dryness and recrystallisation of the residue from MeOH/H2O (2:1) (15mL/g). It has max 264nm ( 9140) in H2O. [Robins Biochemical Preparations 10 145 1963, Baker et al. J Org Chem 22 954 1957.]
