{HEAD ~ The diphenyl sulfone derivatives} previously utilized as {TAIL ~ a color developing agent} or an image stabilizer in a thermosensitive color developing layer of a thermosensitive recording medium were mainly the derivatives containing hydroxyl groups in both ends 
{ HEAD ~ The diphenyl sulfone derivatives } previously utilized as { TAIL ~ a color developing agent } or an image stabilizer in a thermosensitive color developing layer of a thermosensitive recording medium were mainly the derivatives containing hydroxyl groups in both ends
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