Selenic acid 141676-86-0 63090-47-1 CHEBI:18170 H2SeO4 [SeO2(OH)2] dihydroxidodioxidoselenium 481513_ALDRICH Selenic acid solution EINECS 231-979-4 HSDB 675 Selenic acid (H2SeO4) Selenic acid [UN1905] [Corrosive] UN1905 C05697