Patent ID: 8685274

Claim:
A compound represented by formula (1): wherein R 1 is alkyl having 1 to 10 carbons, and in the alkyl, arbitrary â€”CH 2 â€” may be replaced by â€”Oâ€” and arbitrary â€”(CH 2 ) 2 â€” may be replaced by â€”CHâ•CHâ€”; R 2 is alkenyl having 2 to 10 carbons; the ring A 1 , the ring A 2 and the ring A 3 are each independently 1,4-cyclohexylene or 1,4-phenylene; Z 1 , Z 2 and Z 3 are each independently a single bond, â€”(CH 2 ) 2 â€”, â€”(CH 2 ) 4 â€”, â€”COOâ€”, â€”OCOâ€”, â€”CHâ•CHâ€”, â€”CFâ•CFâ€”, â€”CH 2 Oâ€” or â€”OCH 2 â€”; G is â€”CH 2 ; and m, n and p are each independently 0 or 1, and the sum of m, n and p is 1, 2 or 3.