1,2-bis-(5-bromo-2-methyl-3-thienyl)perfluorocyclopentene;1,2-bis(5'-bromo-2'-methyl-3'-thienyl)perfluorocyclopentene;1,2-bis(2-methyl-5-bromo-3-thienyl)hexafluorocyclopentene;1,2-bis(2-methoxy-5-bromothien-3-yl)perfluorocyclopentene;1,2-bis(5-bromo-2-methylthiophen-3-yl)perfluorocyclopentene;
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