http://www.tandf.co.uk/journals/titles/10575 634. asp NATURAL PRODUCT LETTERS Natural Product letters 影响因子:2003年以前 不需要活性,快报 mk时A Free sample background from www.powerpointbackgrounds.com Slide 5 Natural Product Letters 影响因子：2003年以前 不需要活性，快报 http://www.tandf.co.uk/journals/titles/10575 634.asp