{HEAD ~ The invention} is also concerned with the novel 4 alkenyl and 2Z alkenyl compounds and with {TAIL ~ their manufacture} 
{ HEAD ~ The invention } is also concerned with the novel 4 alkenyl and 2Z alkenyl compounds and with { TAIL ~ their manufacture }
HEAD HEAD HEAD HEAD HEAD HEAD REL OTH REL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL