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- W2080771020 abstract "The general structure of antagonists of substance P (SP) which was found with the development of Spantide and analogs based on Spantide served for further refinement. The antagonistic potency was tested in vitro on guinea pig ileum and taenia coli. It was unexpectedly found that introduction of Asn6 gave rise to a considerable increase in potency. The exchange of Gln6 for Asn6 entails the shortening of the side chain by one CH2 unit and seems slight for steric advantages and potency increase. The analog [D-Arg1,D-Cl2Phe5,Asn6,D-Trp7,9,Nle11]SP had pA2 values of 7.4 (ileum) and 8.0 (taenia coli). We then used this sequence as a new lead to introduce new changes, which were made in positions 1, 3, 5, 7 and 9. It was found that Arg1 is important, but Lys3 can be exchanged. The Pal3 derivative had pA2 values of 8.1 and 8.0 and the Nle3 counterpart had 7.7 and 7.4 D-Cl2Phe is an effective substituent in position 5. D-Trp in positions 7 and 9 were superior to other alternatives." @default.
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- W2080771020 date "1989-03-01" @default.
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- W2080771020 title "Increased potency of antagonists of substance P having asparagine in position 6" @default.
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- W2080771020 doi "https://doi.org/10.1016/0167-0115(89)90224-3" @default.
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