Cause and control of Radix Ophiopogonis browning during storage

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Two new phragmalin-type limonoids orthoesters,encandollens A and B (1 and 2),were isolated from the stem barks of Entandrophragma candollei collected in Ghana.The structures of these compounds were elucidated on the basis of HR-ESI-MS,1H and 13C NMR,HSQC,