9H-Purine-6-thiol, 2-amino-9-(3-deoxy-.beta.-D-erythro-pentofuranosyl)-, hydrate (5:4) Guanosine, 3'-deoxy-6-thio- NSC102635 Thioguanine 3'-deoxy-.beta.-D-riboside Thioguanine 9.beta.D-3'-deoxyriboside