1,3,4-Thiadiazolo(3',2':1,2)pyrimido(5,4-b)indol-5(6H)-one, 2-methyl- 117007-34-8 2-Methyl-1,3,4-thiadiazolo(3',2':1,2)pyrimido(5,4-b)indol-5(6H)-one