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pharmaceutical pharmacy organic chemistry medicinal chemistry bop triphenylphosphine diethyl azocarboxylate diazopropane titanium chloride osmium tetroxide wittig reagent wilkinson reagent dicyclohexylcarbodimide diazomethane n-bromosuccinimide aluminium isopropoxide sunthetic reagent and its applications synthetic reagents metamizole sodium celecoxib antipyrine organic reactions name reactions heterocyclic synthesis advance organic chemistry knorr pyrazole heterocyclic chemistry structure elucidation of reserpinr structure elucidation reserpine natural cghemistry sar of adrenergic drugs catecholamines noradrenaline adrenergic drugs sympathetic nerveous system adrenaline m pharm