2864-21-3 4H-Pyrrolo[2,3-d]pyrimidine-4-thione, 1,7-dihydro-7-.beta.-D-ribofuranosyl- 7H-Pyrrolo[2,3-d]pyrimidine-4-thiol, 7-.beta.-D-ribofuranosyl- NSC 100278 NSC100278