1,3,4-Thiadiazolo(3',2':1,2)pyrimido(5,4-b)indole-5(6H)-thione, 2-ethyl- 116989-28-7 2-Ethyl-1,3,4-thiadiazolo(3',2':1,2)pyrimido(5,4-b)indole-5-(6H)-thione 2-Ethyl-6H-1,3,4-thiadiazolo(3',2':1,2)-5-thiopyrimido(5,4-b)indole