With regard to the compounds described in Non Patent Literature 1, there have been {TAIL ~ problems} of {HEAD ~ a long production process} and use of highly toxic tetrafluorosulfur, antimony pentafluoride, or the like as one of raw materials 
With regard to the compounds described in Non Patent Literature 1 , there have been { TAIL ~ problems } of { HEAD ~ a long production process } and use of highly toxic tetrafluorosulfur , antimony pentafluoride , or the like as one of raw materials
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