The developed diphenyl sulfone derivative has {HEAD ~ a higher melting point} than {TAIL ~ the derivative} with two hydroxyl groups at both ends and, as a result, the heat resistance of the thermosensitive recording medium using the diphenyl sulfone derivative was also high 
than
The developed diphenyl sulfone derivative has { HEAD ~ a higher melting point } than { TAIL ~ the derivative } with two hydroxyl groups at both ends and , as a result , the heat resistance of the thermosensitive recording medium using the diphenyl sulfone derivative was also high
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