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(a) Single rectangular cross-shaped tubular crystals of C1 on a glass slide; (b) magnification 4 × of one crystal; (c) view of the crystal mounted on the KappaCCD diffractometer (Bruker-Nonius B.V., The Netherlands) using the KappaCCD video microscope (Bruker-Nonius B.V., The Netherlands); (d) unit cell axis are reported on the crystal: a or a* in red, b or b* in green, c or c* in blue.
