3,4-diethoxy-1,2,5-thiadiazole-1,1-dioxide; CAS No.: 55904-84-2; 3,4-diethoxy-1,2,5-thiadiazole-1,1-dioxide is a colorless liquid. Store refrigerated in sealed vials. 3,4-diethoxy-1,2,5-thiadiazole-1,1-dioxide is volatile; CAS No.: 55904-84-2 avoids moisture.