S-13 Natural Products-Initiated Chemistry and Chemical Biology toward Drug Discovery S13-1 Screening of unique microbial functions and their industrial applications S13-2 Natural product-based chemical biology and drug discovery S13-3 Construction of chemical library by utilizing the biosynthetic function of microorganisms S13-4 Discovery and development of isozyme-selective inhibitors S13-5 A novel strategy for systematic identification of intracellular targets of bioactive natural products S13-6 Synthetic studies on polyketide-derived polycyclic natural products