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4,4,5,5-Tetramethyl-2-(9,9'-spirobi[fluorene]-2-yl)-1,3,2-dioxaborolane (CAS 884336-44-1) is a pharmaceutical-grade boronic ester intermediate manufactured directly by Yurui (Shanghai) Chemical Co., Ltd. to its in-house standard. It is distributed across North and South America, Europe, Asia, the Middle East, and Africa.
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