The present application describes novel .beta.-amino acid derivatives of formula I: ##STR1## or pharmaceutically acceptable salt or prodrug forms thereof, wherein A, X, Z, U.sup.a, X.sup.a, Y.sup.a, Z.sup.a, R.sup.1, R.sup.2, R.sup.3, R.sup.4, and R.sup.4a are defined in the present specification, which are useful as metalloprotease and/or as TNF-.alpha. inhibitors.

L'applicazione attuale descrive i derivati acidi beta.-amminici del romanzo della formula I: ## del ## STR1 o farmaceuticamente il sale o il prodrug accettabile forma di ciĆ², in cui A, la X, la Z, U.sup.a, X.sup.a, Y.sup.a, Z.sup.a, R.sup.1, R.sup.2, R.sup.3, R.sup.4 e R.sup.4a sono definiti nella specifica attuale, che sono utili come metalloprotease e/o come inibitori di TNF-.alpha..

 
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