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                                                                  1.  “√ °—¥ methanol ®“°·°àπ¡–À“¥
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             H SO  reagent                              50 ¡‘≈≈‘≈‘μ√ ‡ªìπ‡«≈“ 60 π“∑’ æ∫«à“ ‡¡∑“πÕ≈
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             μ—«Õ¬à“ß·°àπ¡–À“¥ ®–æ∫ spot ¢Õß oxyresveratrol  impurity ™π‘¥Õ◊ËπªπÕÕ°¡“πâÕ¬ ·≈– “√≈–≈“¬
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