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Also, compound (I) where R13 and/or R14 are hydrogen can be alkylated/acylated to a corresponding compound of formula (I) where R13 and/or R14 are not hydrogen, if desired, by reacting it with a suitable alkylating or acylating agent, in the presence of a base (e.g., sodium carbonate, sodium hydride, triethylamine, and the like) and in a polar aprotic solvent such as methylene chloride, dioxane, a
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