Abstract
Syntheses and biological properties are reported for two analogs of oxytocin in which the glycinamide and the leucylglycinamide moiety, respectively, have been deleted from the parent hormone. Both [des-9-glycinamide]oxytocin and [des-9-glycinamide,des-8-leucine]oxytocin are weak agonists in the rat uterotonic and antidiuretic assays but possess no detectable rat pressor activity. In addition, [des-9-glycinamide]oxytocin is an inhibitor of the oxytocin-induced vasodepressor response in fowl but is a potent agonist in the hydroosmotic assay of the toad urinary bladder.
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