5-(3,4-Dimethoxyphenyl)-2-(ethylthio)-6,7,8,9-tetrahydropyrimido[4,5-b]quinolin-4-amine 5-(3,4-Dimethoxyphenyl)-2-(ethylthio)-6,7,8,9-tetrahydropyrimido[4,5-b]quinolin-4-ylamine AIDS-144467 AIDS144467 NSC667081