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5. Supplementary material
Crystallographic data for the structural analyses have
been deposited with the Cambridge Crystallographic
Data Centre, CCDC, Nos. 236487-236489 for com-
pounds 8, 7 and 6, respectively. Copies of this infor-
mation may be obtained free of charge from The
Director, CCDC, 12, Union Road, Cambridge CB2 1EZ
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