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5,11,17,23-tetrakis(1,1-dimethylethyl)-25,26,27,28-tetramethoxy-2,8,14,20-tetrathiapentacyclo[19.3.1.1(3,7).1(9,13).1(15,19)]octacosa-1(25),3,5,7(28),9,11,13(27),15,17,19(26),21,23-dodecaene-2,2,8,8,14,14,20,20-octaoxide