2-(2-Acetamido-1,1-dimethylethyl)-4-mercapto-6-propyl-2-pyrimidinol 2-(Acetamido-tert-butyl)-6-propyl-isothiouracil 2-Pyrimidinol, 2-(2-acetamido-1,1-dimethylethyl)-4-mercapto-6-propyl- B-50 USAF B-50 UW5992500