盐酸氮卓斯汀/丙酸氟替卡松杂质盐酸氮卓斯汀杂质A azelastine hydrochloride impurity A盐酸氮卓斯汀杂质B azelastine hydrochloride impurity B盐酸氮卓斯汀杂质C azelastine hydrochloride impurity C盐酸氮卓斯汀杂质D azelastine hydrochloride impurity D丙酸氟替卡松杂质A Fluticasone propionate impurity A丙酸氟替卡松杂质B Fluticasone propionate impurity B丙酸氟替卡松杂质C Fluticasone propionate impurity C丙酸氟替卡松杂质D Fluticasone propionate impurity D