5,7-Bis(2-furylmethylene)-1,11-diphenyl-2,10-dithia-4,5.lambda.~5~,7.lambda.~5~,8-tetraaza-6.lambda.~2~-stannaundeca-3,8-diene-3,9-dithiol compound with butane (1:2) AIDS-133828 AIDS133828 NSC630459