6-Chloro-2-iodo-7H-purine , its CAS NO. is 18552-90-4, the synonyms are 6-Chloro-2-iodo-9h-purine ; 6-Chloro-2-iodopurine ; 6-Chloro-2-iodo-1H-purine ; 2-Iodo-6-chloropurine .