6,6-Dimethyl-1,11-diphenyl-5,7-bis(1-(2-pyridinyl)ethylidene)-2,10-dithia-4,5.lambda.~5~,7.lambda.~5~,8-tetraaza-6-stannaundeca-3,8-diene-3,9-dithiol AIDS-133825 AIDS133825 NSC630456