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