18440-68-1 7H-Pyrrolo[2,3-d]pyrimidine-5-carboxylic acid, 4-amino-7-.beta.-D-ribofuranosyl-, methyl ester 7H-Pyrrolo[2,3-d]pyrimidine-5-carboxylic acid, 4-amino-7-beta-D-ribofuranosyl-, methyl ester NSC116279