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How were the relative contributions of the steric, electrostatic, hydrophobic, H-bond donor and H-bond acceptor parameters (10.2, 25.6, 19.9, 30.7, and 13.6%, respectively) established?  Given that the number of H-bond acceptors and donors varies with the specific substituents, how can these be pre-fixed? Likewise, how does the model accommodate differences in hydrophobicity or electronic characteristics?  ¸ÄÈçºÎ»Ø´ðÄØ£¿
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