Abstract
Complete analyses of NMR data of oxytocin (OT) and 4 analogues, ([o-MePhe(2)]OT, [mMe-Phe(2)]OT, [m-OMePhe(2)]OT and [p-MePhe(2)]OT), are given. The same conformational behavior in solution on one hand and large differences in biological activities on the other hand indicate that the compounds adopt a "biologically active conformation" at the stage of interaction with the receptor when the character of the substituent and its position on the aromatic ring may play a role in hindering attaining the ideal complementarity of both interacting components.
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