Electronic Supplementary Information (ESI) for Polymer Chemistry This journal is (c) The Royal Society of Chemistry 2013 Electronic Supplementary Information (ESI) for Synthesis and Characterization of a New Multifunctional Polymeric Prodrug Paclitaxel-Polyphosphoester-Folic Acid for Targeted Drug Delivery Guoyi Zhang, Mingzu Zhang, Jinlin He, Peihong Ni* College of Chemistry, Chemical Engineering and Materials Science, Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application, Soochow University, Suzhou 215123, China. Email: phni@suda.edu.cn; Tel: +86-512-65882047. Electronic Supplementary Material (ESI) for Polymer Chemistry This journal is © The Royal Society of Chemistry 2013