15737-99-2 6H-Purine-6-thione, 1,7-dihydro-, lead complex Lead, bis(1,7-dihydro-6H-purine-6-thionato-N7,S6)-, (T-4)- Lead, bis(1,9-dihydro-6H-purine-6-thionato-N7,S6)-, (T-4)- NSC68295