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Figure 9<br />

Composition of ten original nonpeptidic libraries of the sequence DArg-Arg-X-Y-Arg.<br />

X and Y were selected from the set of scaffolds shown in Table 1. Also shown<br />

are the subsequent breakdown libraries from original library number 1. Two-letter codes<br />

used in the figure correspond to the different nonpeptide moieties described in Table 1.<br />

Specifically, PH = phenanthridinone, CB = carboline, SP = spirocycle, SC = Straight<br />

chain, CN = cinnamic acid.<br />

Page 144<br />

four novel nonpeptidic structures showed that only one of the four had affinity to the receptor (Figure<br />

8c). This new compound, I, was subsequently shown to be an antagonist in a cellular assay measuring<br />

bradykinin-stimulated IP turnover [18]. Overall, there were 285 possible structures to survey due to the<br />

number of structure-<strong>based</strong> scaffolds that were prepared. This was rapidly accomplished via 19 synthetic<br />

couplings, 19 assays, and 4 purifications.<br />

Not surprisingly, compound I showed divergent potency when assayed in different species homologues<br />

of the bradykinin B2 receptor. In particular, in a model of bradykinin-induced hypotension in rats and<br />

rabbits, it showed no activity. Likewise, it did not block bradykinin-induced contraction of the isolated<br />

guinea pig ileum. Since compound I is considerably smaller than previously reported decapeptide<br />

antagonists, subtle structural differences (which are<br />

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