ADT derivatives in free or salt forms, organic or mineral bases, in which the ADT derivatives contain the characteristic group --S-- CH.sub.2 - -CH.sub.2 --CH(NHR)--CO-- in the cyclical form ##STR1## in which R represents an acyl group containing more than 4 carbon atoms and substituted when it is cynnamoyl, and the open form ##EQU1## in which X is oxygen or sulfur, R' and R are the same or different and are selected from the group of hydrogen and acyl radicals, R" is hydrogen or a substituted alcoyl such that R" has at least 2 carbon atoms when X is oxygen, R is a lower acyl and R' is hydrogen.
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