New thiopropanoylamino acid derivatives which have the formula ##STR1## wherein R and R.sub.1 each is lower alkyl; R.sub.2 and R.sub.3 each is hydrogen or lower alkyl; or R.sub.1 can be joined to either R or to R.sub.2 in a five membered ring; R.sub.4 is hydrogen, lower alkanoyl or benzoyl; Are useful as hypotensive agents.
新的
硫代丙酰胺基酸衍
生物,
化学式为##STR1## 其中R和R.sub.1各自是较低的烷基;R.sub.2和R.sub.3各自是氢或较低的烷基;或者R.sub.1可以连接到R或R.sub.2中的任一者形成一个五元环;R.sub.4是氢、较低的烷酰基或苯甲酰基;可用作降压剂。