Further, in order to obtain an optimum reaction condition, salts such as sodium chloride, {HEAD ~ metal ions} such as zinc ion and {TAIL ~ other additives} and auxiliary agents which are commonly used in this art may be added to the reaction system 
Further , in order to obtain an optimum reaction condition , salts such as sodium chloride , { HEAD ~ metal ions } such as zinc ion and { TAIL ~ other additives } and auxiliary agents which are commonly used in this art may be added to the reaction system
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