[1-Mercaptodimethylacetic acidloxytocin,[l+'-mercapto-a, a-dimethylpropionic acidloxytocin, and [1-P-mercapto-0, P-diethylpropionic acidloxytocin, analogs of deaminopenicillamine- oxytocin, have been synthesized from a common protected octapeptide resin intermediate and purified by sequential gel fil-tration on Sephadex G-15 in 50% AcOH and 0.2 N AcOH. The 3 compounds were devoid of oxytocic and avian vasodepressor activities, but all ...