53528-97-5 5H-1,3,4-Thiadiazolo(3,2-a)pyrimidine-5,7(6H)-dione, 8,8a-dihydro-6-methyl-8-propyl- 8,8a-Dihydro-6-methyl-8-propyl-5H-1,3,4-thiadiazolo(3,2-a)pyrimidine-5,7(6H)-dione