21090-38-0 7H-Pyrrolo[2,3-d]pyrimidine-5-carboxylic acid, 4-amino-7-.beta.-D-ribofuranosyl-, monohydrochloride 7H-Pyrrolo[2,3-d]pyrimidine-5-carboxylic acid, 4-amino-7-.beta.-D-ribofuranosyl-, monohydrochloride, hemihydrate NSC116276