Helvolic Acid Obtained From Biotransformation of Ursolic Acid by Metarhizium Anisopliaein
CHEN Yan-qiong1, LI Xiao-qing1，2, OUYANG Wen1, XU Hong1, CHEN Hong-zhang1, CAO Yong1*
NATURAL PRODUCT RESEARCH AND DEVELOPMENT . 2014, (Suppl1): 87 -92 .