42311-25-1 Formamidine, N'-(5-cyano-7-.beta.-D-ribofuranosyl-7H-pyrrolo[2,3-d]pyrimidin-4-yl-N,N-dimethyl- NSC143686 Pyrrolo[2,3-d]pyrimidine-5-carbonitrile, 4-[[(dimethylamino)methylene]amino]-7-.beta.-D-ribofuranosyl-