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D 2555 (OTTO) 3,4-Dibromothiophene, 99% Cas 3141-26-2 - used in the preparation of thieno[3,4-b]thiophene. D 2555 (OTTO) 3,4-Dibromothiophene, 99% Cas 3141-26-2 - used as starting material in the synthesis of alkyl substituted, fused thiophenes.