Asymmetric total synthesis of polycyclic xanthenes and discovery of a WalK activator active against MRSA oleh Min-Jing Cheng, Yan-Yi Wu, Hao Zeng, Tian-Hong Zhang, Yan-Xia Hu, Shi-Yi Liu, Rui-Qin Cui, Chun-Xia Hu, Quan-Ming Zou, Chuang-Chuang Li, Wen-Cai Ye, Wei Huang, Lei Wang