| http://www.w3.org/ns/prov#value | - , an acyl group, an unsubstituted or substituted phenyl group, or an unsubstituted or substituted phenylsulfonyl group; R5 and R6 independently represent hydrogen or an alkyl group; X2 and X3 independently represent hydrogen, Na, K, Li or an organic amine; n3, n5 and n6 each are an integer of 1 or 2; n8 is an integer of 0 or 1; and n4 is an integer of 1 through 3; and ##STR9## wherein R7 represent
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