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Ô­ÎÄ£ºAn amount of 0.9 g of 1a was dissolved in hot ethanol
and the resulted solution was stored in a desiccator in the
presence of methanol. An amount of 0.85 g (94.4 %) of
bright-blue needle-like crystals 1b were isolated and dried
in vacuum (1 mm Hg/ 80 C).
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