| http://www.w3.org/ns/prov#value | - N(CHR1X) 2 at least one R?? is other than hydrogen and that where A and A' are groups N. CHR. ,X at least one CHR,X group is other than a CH2X3 group (where X3 represents a carboxyl group or a derivative thereof or a 2. hydroxyethyl or 2,3. dihyroxypropyl group) , or a salt or metal chelate thereof.
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