1H-Imidazole-4-carbothioamide, 5-(formylamino)-1-(2,3,5-tri-O-formyl-beta-D-ribofuranosyl)- 27115-65-7 27115-90-8 5-Formamido-1-beta-D-ribofuranosylthioimidazole-4-carboxamide 2',3',5'-triformate NSC 238940