(1,2,5)Thiadiazolo(3,4-d)pyrimidine-5,7(4H,6H)-dione, 4-methyl- 3-Methyl-8-thiaxanthin 4-Methyl-(1,2,5)thiadiazolo(3,4-d)pyrimidine-5,7(4H,6H)-dione 62700-61-2