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Excess TFA was added to [II] (2.00 g, 3.63 mmol) in CH2Cl2 at 0° C. The solution was stirred at 0° C. for 30 minutes and at room temperature for 15 minutes, and then the reaction was worked up by the method used for (5). Silica gel column chromatography with 2% MeOH/CHCl3 provided 1.51 g (92%) of [III] as an oil: NMR δ 1.17-1.90 (m, 14H), 2.23-2.50 (m, 4H), 2.90 (t, 2H, J=6), 3.40 (s, 1H), 3.63 (t, 2H, J=6), 4.67 (s, 2H), 4.77 (s, 2H), 7.30 (s, 5H), 7.33 (s, 5H). Anal. (C27H37N3O3) C, H, N.