34635-44-4 6-Methyltetrazolo(1,5-c)pyrimidine-5,7(6H,8H)-dione Tetrazolo(1,5-c)pyrimidine-5,7(6H,8H)-dione, 6-methyl- Tetrazolo(5,4-a)-6-methyluracil Vmi 502 Vmi-502