Figure 15.
X-ray crystal structure of 33a. Crystal data: monoclinic, space group Pc, a 8.4327(3), b 21.6152(8), c 13.3512(5) Å, β 100.578(1)°, V 2392.23(15) Å3, Z 4, Dc 1.501 g/cm3, F(000) 1136, crystal size 0.20 × 0.25 × 0.35 mm [53].
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