| http://www.w3.org/ns/prov#value | - c, or heteroaromatic compound, or a mixture of any of these, and Y1 and Y2 are any aliphatic, cycloaliphatic, aromatic, substituted aliphatic, substituted aromatic, heteroaliphatic, heterocyclic, or heteroaromatic compound, or a mixture of any of these, and where n is an integer equal to or greater than 1.
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