(5-Tert-Butyl-2-thioxo-2-lambda-~5~-[1,3,2]oxazaphosphinan-2-yl)-dimethyl-amine AIDS-128991 AIDS128991 NSC314863 compound with (5-tert-butyl-2-thioxo-2-~lambda~-5-[1,3,2]oxazaphosphinan-2-yl)-dimethyl-amine