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19. Crystal structures of similar insertion products have already been described: (a) Wattenbach, C.; Palme-König, R.; Flock, S.; Müller, U.; Frauenrath, H. Z. Kristallogr. NCS 2001, 216, 399. (b) Wattenbach, C.; Palme-König, R.; Flock, S.; Müller, U.; Frauenrath, H. Z. Kristallogr. NCS 2001, 216, 401.
