| http://www.w3.org/ns/prov#value | - s hydrogen, alkyl, alkoxy, halogen or ##STR208## wherein R3 and R4 represent alkyl, substituted or non-substituted aralkyl, or substituted or non-substituted aryl group, and R3 and R4 may form a ring; and m is an integer of 0, 1, 2 or 3, when m is 2, R2 may be the same or different.) ##STR209## (wherein R1, R2 and R3 are hydrogen, lower alkyl, lower alkoxy, dialkylamino, or halogen; and n is 0 or
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