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