| http://www.w3.org/ns/prov#value | - ity of, preferably 3 to 20, more preferably 3 to 10, particularly prefereably 3 to 7 carbon atoms in the atoms intermediately existing between at least two ether linkages. [0393] Such polyether compound as mentioned above includes, for example, those represented by the following formula [0394] wherein n is an integer of 2???n???10, R1-R26 are each a substituent having at least one element selected
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