146404-37-7 7H-1,2,3-Triazolo(4',5':4,5)pyrimido(6,1-b)(1,3)thiazin-5(1H)-one, 8,9-dihydro- 7H-8,9-Dihydro-(1,2,3)triazolo(4',5'-4,5)pyrimido(6,1-b)(1,3)thiazine-5(1H)-one 9H-7,8-Dihydro-(1,2,3)triazolo(4',5'-4,5)pyrimido(6,1-b)(1,3)thiazine-5(3H)-one Trpyrth