HPLC conditions: Lichrospher Si (5 µm, 250 × 4.6 mm), hexane-MTBE = 70:30, 0.6 mL/min, 265 nm, 25 °C.
12a Crystal data of compound 1: C39H54N6O6S3, M
w = 799.06, colorless prism of 0.30 × 0.12 × 0.10 mm, T = 173 K, orthorhombic, space group P 21 21 21, Z = 4, a = 12.5430 (10) Å, b = 18.4770 (10) Å, c = 18.5730 (10) Å, α = 90.000(10), β = 90.000(10), γ = 90.000(10)°, V = 4304.4 (5) Å3, d
calc = 1.233 g cm-3, F(000) = 1704, λ = 0.71073 Å (Mo, Kα), µ = 0.086 mm-1, Nonius kappa CCD diffractometer, θ range 1.55-25.01°, 7270 collected reflections, 7241 unique, full-matrix least-squares (SHELXL9712b), R1 = 0.0586, wR2 = 0.1142, (R1 = 0.1026, wR2 = 0.1304 all data), goodness of fit = 1.029, residual electron density between 0.254 and -0.263 e Å-3. Hydrogen atoms fitted at theoretical positions. Further details on the crystal structure are available on request from Cambridge Crystallographic Data Centre, 12 Union Road, Cambridge, UK on quoting the depository number 246445.