Thiophene,3,4-dibutyl-2-iodo-5-[2-(trimethylsilyl)ethynyl], 1,2,3,4-Benzenetetracarboxylic acid, 3,4-dibutyl-2-iodo-5-trimethylsilylethynylthiophene, benzenetetracarboxylic acid, 1,2,3,4-benzenetetracaboxylic acid, 2-iodo-3,4-dibutyl-5-trimethylsilylethynylthiophene, 3,4-dicarboxyphthalic acid, Benzol-1,2,3,4-tetracarbonsaeure, benzene-1,2,3,4-tetracarboxylic acid