| http://www.w3.org/ns/prov#value | - In some embodiments, the aldehyde or acetal has three phosphono groups substituted thereon (e.g., by coupling to dipyrromethane at the 5 position a group of the formula ???R1(R2Z)3, where R1 is a first linking group, R2 is a second linking group, and Z is a phosphono group).
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