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International Journal of Molecular Sciences Article Design, Synthesis, and Cytotoxic Analysis of Novel Hederagenin–Pyrazine Derivatives Based on Partial Least Squares Discriminant Analysis Kang Fang, Xiao-Hua Zhang, Yao-Tian Han, Gao-Rong Wu, De-Sheng Cai, Nan-Nan Xue, Wen-Bo Guo, Yu-Qin Yang...