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An analogue of oxytocin containing a nitro group ortho to the phenolic hydroxyl group of the tyrosyl residue was prepared by nitration of the hormone with tetranitromethane. [2-(3-Nitro-l-tyrosine)]oxytocin was bound by neurophysin although its pharmacological activity was virtually abolished. The oxytocic activity of the analogue on the isolated rat uterus was 1.1i.u./mg.

[2-(3-Nitrotyrosine)]oxytocin, a weakly active analogue of the hormone bound by neurophysin (Short Communication)