Synthesis of four impurities-Ibuprofen A, F, Q and R were synthesized by unexposed route which can be used as pharmaceutical secondary standards for application in quality control provide pharma laboratories and manufacturers with a convenient and costeffective alternative to the preparation of in-house working standards. The impurities were monitored by HPLC, and their structures are accurately assigned on the basis of fragmentation patterns in LC−MS and NMR spectroscopy.
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