(1,2,5)Thiadiazolo(3,4-d)pyrimidine-5,7(4H,6H)-dione, 6-methyl- 1-Methyl-8-thiaxanthin 6-Methyl-(1,2,5)thiadiazolo(3,4-d)pyrimidine-5,7(4H,6H)-dione 62700-60-1