2-β-d-ribofuranosylbenzoxazole from 2,5-anhydro-d-allonoimidate, and 1,3-dimethyl-8-β-d-ribofuranosylxanthine from 2,5-anhydro-d-allono-thioimidates and -dithioates
2-β-d-ribofuranosylbenzoxazole from 2,5-anhydro-d-allonoimidate, and 1,3-dimethyl-8-β-d-ribofuranosylxanthine from 2,5-anhydro-d-allono-thioimidates and -dithioates