The oscillatory behavior of a [Ru(bipy)(3)](2+)/bromomalonic acid/bromate Belousov-Zhabotinsky system is studied. With a set of reactions based on direct experiments in the inorganic and organic reaction subsets the oscillatory behavior of this system can be well modeled. Two different negative feedback loops are involved : the primary negative feedback loop is the reaction of bromide with bromous acid; the secondary loop involves reactions of organic radicals with BrO2. radicals.