| http://www.w3.org/ns/prov#value | - nickel, or cyclosporin, or a derivative thereof with minor structural modifications; b) Y represents a polyethylene linker having the general formula (CH.sub.2--X--CH.sub.2).sub.n, where X represents O, S, SO, or SO2, and n is an integer from 2 to 25; c)
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