125209-33-8 4-Thiomorpholinecarbothioic acid, S-(4-oxo-4H-pyrido(1,2-a)pyrimidin-9-yl) ester 9-((4-Thiomorpholin-4-yl)carbonylthio)-4-oxo-4H-pyrido(1,2-a)pyrimidine S-(4-Oxo-4H-pyrido(1,2-a)pyrimidin-9-yl) 4-thiomorpholinecarbothioate