2,16,22,23-Tetraoxa-9-thiatetracyclo(15.3.1.1(sup 4,7).1(sup 14))-tricosa-1(21),4,6,11,13,17,19-heptaene-3,15-dione 2-Furoic acid, 5,5'-thiodimethylenedi-, cyclic ester with resorcinol 71349-40-1 BRN 1665820