| http://www.w3.org/ns/prov#value | - each Y, which may be the same or different, is ##STR1## where R1 is, or, when n is more than 1, each R1, which may be the same or different, is an alkyl, alkenyl, aralkyl, N-substituted carbamyl, phenyl, NO2, halogen or ##STR2## group where R2 is a C1 -C4 alkyl group; n is 0, 1, 2 or 3; and
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