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(19) Homodimer 9 could not be separated under current chiral
HPLC conditions, most probably due to its poor solubility.
(20) CCDC 1941860 (meso-9) contains the supplementary
crystallographic data for this paper. These data can be obtained free
of charge from The Cambridge Crystallographic Data Centre via
(16) CCDC 1546340 (5d) contains the supplementary crystallo-
graphic data for this paper. These data can be obtained free of charge
from The Cambridge Crystallographic Data Centre via www.ccdc.
(17) CCDC 1941845 (7a) and CCDC 1941846 (meso-7a) contain
the supplementary crystallographic data for this paper. These data can
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