| http://www.w3.org/ns/prov#value | - recited as R. The preference among them also applies. [0093] Of the compounds represented by formula (B-II), those represented by formula (B-VI) are still preferred. [0094] wherein B and X2 are as defined above (the preference also applies); Zb6 has the same meaning as Zb5 in formula (B-V) (the preference is also the same); and n is an integer of 2 to 8, preferably 2 to 6, still preferably 2 to 4
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