| abstract |
(57) [Summary] Formula (I): [Wherein R 1 represents hydrogen or an organic substituent; R 2 represents a compound represented by the general formula (a): (Wherein R 4 and R 5 are independently hydrogen or one or more substituents substituting a hydrogen atom in the ring system; m is 2 or 3; p is 0, 1 Or 2), R 3 is hydrogen, a salt-forming cation or an ester-forming group; and the symbol ═ / = is a double bond which is either E or Z. Of the above configuration]. |