10,13,16,19,24,25-Hexaoxa-3-thiatricyclo(19.2.1.1(sup 5,8))pentacosa-5,7,21,23-tetraene-9,20-dione 2-Furoic acid, 5,5'-thiodimethylenedi-, cyclic ester with 2,2'-ethylenedioxydiethanol 71349-35-4