10,16,21,22-Tetraoxa-3,13-dithiatricyclo(16.2.1.1.(sup 5,8))docosa-5,7,18,20-tetraene-9,17-dione 2-Furoic acid, 5,5'-thiodimethylenedi-, cyclic ester with 2,2'-thiodiethanol 71349-33-2 BRN 1663626