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netLibrary - eBook Summary Structure-based Drug Design by ...

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Page 15<br />

Thiazoles are less electron-rich isosteres of pyridines and therefore it was speculated that compounds<br />

with such substitution may have improved metabolic stability [30]. The modeling of A-82200 in which<br />

the N-terminal pyridinyl group was substituted <strong>by</strong> a 4-thiazolyl moiety indicated that the 5-membered<br />

ring binds in the S3 subsite and can be further derivatized at the 2 position <strong>by</strong> an isopropyl group. The<br />

isopropyl functionality makes van der Waals contacts with Val82 and fills the hydrophobic part of the<br />

S3 subsite in nearly optimal fashion.<br />

http://legacy.netlibrary.com/nlreader/nlReader.dll?bookid=12640&filename=Page_15.html (1 of 2) [4/5/2004 4:44:40 PM]

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