{HEAD ~ The compound} 1, wherein n is the integer 0, X1 is a single convalent bond, ring {TAIL ~ A1} is trans 1,4 cyclohexylene, ring A2 is 1,4 phenylene, R1 is 4 pentenyl and R2 is ethyl, CN or NCS 
wherein
{ HEAD ~ The compound } 1 , wherein n is the integer 0 , X1 is a single convalent bond , ring { TAIL ~ A1 } is trans 1,4 cyclohexylene , ring A2 is 1,4 phenylene , R1 is 4 pentenyl and R2 is ethyl , CN or NCS
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH