In the general formulae [13] to [15], the alkyl group having 1 to 12 carbon atoms, shown by R10 to R11 may be straight chained, branched or cyclic, and includes one having preferably 1 to 10 carbon atoms, more preferably 6 to 8 carbon atoms, which is specifically exemplified by the same as examples of the alkyl group having 1 to 12 carbon atoms, shown by R1 in the general formula [2], and among ot