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Briefly, to a solution of folic acid (1.0 g, 2.27 mmol) in 40 ml of dry DMSO was
added triethylamine (0.5 ml), N-hydroxysuccinimide (0.52 g, 5.00 mmol), and
dicyclohexylcarbodiimide (0.50 g, 2.50 mmol). The mixture was stirred at room temperature in
the dark for 24 h. The byproduct, dicyclohexylurea, was filtered off, and 200 ml of
acetone/diethyl ether (1:3, v/v) was added to precipitate the product.

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