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CAS NO:51-21-8;   MF:C4H3FN2O2
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CAS NO:51-36-5;   MF:C7H4Cl2O2
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CAS NO:51-44-5;   MF:C7H3Cl2O2
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CAS NO:51-48-9;   MF:C15H11I4NO4
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