{TAIL ~ A composition} 1 in which {HEAD ~ the condensation catalyst} is crystalline and is a compound selected from the group consisting of imidazole, 1,2 dimethylimidazole, 1,3 diacetyl 2 imidazolidinone, 1,4 diazabicyclooctane, 1,1 cyclopentylidenebis 1H pyrazole, and 3,5 dimethylpyrazole 1 methanol 
{ TAIL ~ A composition } 1 in which { HEAD ~ the condensation catalyst } is crystalline and is a compound selected from the group consisting of imidazole , 1,2 dimethylimidazole , 1,3 diacetyl 2 imidazolidinone , 1,4 diazabicyclooctane , 1,1 cyclopentylidenebis 1H pyrazole , and 3,5 dimethylpyrazole 1 methanol
TAIL TAIL TAIL TAIL TAIL TAIL OTH REL OTH 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH