| http://www.w3.org/ns/prov#value | - In FIG. 17A, X9 is S, O, SO, SO2, CH2, CHF, CF2 or NR10 and R10 is (independently) H, F, OH, OCH3, CH3, or CH-lower alkyl provided that adjacent X9 are not both O. In FIGS. 17B and 17C, each Y is independently selected and has the meaning described above (e.g. Y is H, an oligomer, a blocking group such as FMOC, tBOC, OH, DMT, MMT or an coupling group suitable for oligomer synthesis).
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