{HEAD ~ The concentration} of {TAIL ~ the para aminoacetanilide} is determined by a color test in which the para aminoacetanilide was reacted with phenol 
of
{ HEAD ~ The concentration } of { TAIL ~ the para aminoacetanilide } is determined by a color test in which the para aminoacetanilide was reacted with phenol
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH