| http://www.w3.org/ns/prov#value | - 2 and R3 are CH2 CH3, R4 is CH3, R7 and R8 are O(CH2 CH2 O)2 CH2 CH2 OCH3, alternatively, R8 is a site-directed molecule or a couple thereto, preferably an oligonucleotide or a couple thereto, more preferably O(CH2)n CO-oligonucleotide where n is 1-7 and preferably 1-3.
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