prov:value
| - alkenyl, alkynyl, amino, amido, azido, aryl, heteroaryl, carboxylic acid, cyano, guanidino, halo, haloalkyl, haloalkoxy, hydrazino, ODMT, alkylsulfonyl, nitro, sulfide, sulfone, sulfonate, sulfonamide, thiol, and thioalkoxy; provided that X6 is not hydrogen; [0318] R4 is a hydroxyl group or a protected hydroxyl group; [0319] R5??? is hydrogen, C1-C10 alkyl, C2-C10 alkenyl, C2-C20 alkynyl, C6-C14 a
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