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Condensed trimethylamine (∼ 2 mL) was
added dropwise to a solution of compound 7 (120 mg) in THF (5 mL) at
¨C78 ¡ãC. The mixture was allowed to warm up to room temperature. The
precipitate was re-dissolved by the addition of water (10 mL). After the
mixture was cooled down to ¨C78 ¡ãC, extra trimethylamine (∼ 2 mL) was
added and the mixture was stirred for 24 h at room temperature.
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