| http://www.w3.org/ns/prov#value | - It is preferable that the above-mentioned chemical adsorbent is a compound wherein A1 is bonded to 4-position of a benzene ring and, additionally, is a characteristic group represented by the following Chemical Formula 6-3 or Chemical Formula 6-4. (k is an integer of 1 to 18 inclusive, m and n are an integer of 0 to 37 inclusive, m+n=2k+1, p is an integer of 0 or 1, and q is an integer of 0 or 1.)
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