1,3,4-Thiadiazolo(3',2':1,2)pyrimido(5,4-b)indol-5(6H)-one, 2-(methylthio)- 116989-22-1 2-(Methylthio)-1,3,4-thiadiazolo(3',2':1,2)pyrimido(5,4-b)indol-5(6H)-one