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