This is Van、 from Ha Noi University of Pharmacy、 Ha Noi City、 Viet Nam.I wonder to know the price of reference substances: astragaloside IV、 tanshinone IIA 、 aconine、 aconitine、 asiaticoside、 ginsenoside (Rb1、Rg1).The content is about 98%. Quantity: 500mg.These materials just use for science studys、 not for human .Please、 kindly provide: price per piece & Minimum order quantity .I would appreciate your early reply in advance.