125209-42-9 3-Thiazolidinecarbothioic acid, S-(4-oxo-4H-pyrido(1,2-a)pyrimidin-9-yl) ester 9-((Thiazolidin-3-yl)carbonylthio)-4-oxo-4H-pyrido(1,2-a)pyrimidine S-(4-Oxo-4H-pyrido(1,2-a)pyrimidin-9-yl) 3-thiazolidinecarbothioate