tert-Butyl 3-[4-(2-Bromoethoxy)-3-chlorophenyl]-5-methylisoxazole-4-carboxylate

The title compound, C₁₇H₁₉BrClNO₄, has been prepared for the development of homogeneous immunoassays involving penicillins as tracers. An X-ray diffraction study has shown that the Cl atom is located ortho to the bromoethoxy group on the aromatic ring.

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