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1-(4-nitrophenoxy)-4-[4-(4-nitrophenoxy)phenyl]benzene benzene derivatives PI monomer polyimide monomer CAS NO.17095-00-0
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1-(4-nitrophenoxy)-4-[4-(4-nitrophenoxy)phenyl]benzene benzene derivatives PI monomer polyimide monomer CAS NO.17095-00-0
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