prov:value
| - wherein R, R6, and R10 are each selected from hydrogen, substituted or unsubstituted lower alkyl alkylR9, or ???COR9 where R9 is selected from hydroxy, substituted lower alkoxy, substituted or unsubstituted amino, glycine ester, halide (chloro, bromo, iodo) or OR (OR is a leaving group such as mesylate, triflate, or tosylate) or an activated leaving group; R1 is selected from hydrogen, or substitu
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