A suitable phenol formaldehyde is m cresol formaldehyde and {HEAD ~ a suitable sensitizer} is {TAIL ~ a naphthoquinone diazide sulfonic acid ester} 
is
A suitable phenol formaldehyde is m cresol formaldehyde and { HEAD ~ a suitable sensitizer } is { TAIL ~ a naphthoquinone diazide sulfonic acid ester }
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL