110543-86-7 2-(2-Ethoxyphenyl)-5H-(1)benzothieno(3,2-d)-1,3,4-thiadiazolo(3,2-a)pyrimidin-5-one 5H-(1)Benzothieno(3,2-d)-1,3,4-thiadiazolo(3,2-a)pyrimidin-5-one, 2-(2-ethoxyphenyl)-