We are supplier of of 10-Hydroxycamptothecin in Hangzhou,China.We have completely different ways of synthesizing the product,and we have the patent for the technique. So the 10-Hydroxycamptothecin from our company is much lower than the market.We can supply 10-Hydroxycamptothecin 10KGS a month. If interest,please contact us to ask for sample.We will reply you immediately.