{HEAD ~ The present invention} relates to {TAIL ~ a process} for purifying a polar vinyl compound such as N vinylcarboxamides 
relates to
{ HEAD ~ The present invention } relates to { TAIL ~ a process } for purifying a polar vinyl compound such as N vinylcarboxamides
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH