Modified glycopeptides

A compound of the formula:

• ##STR20## wherein R and R.sup.1 are hydrogen or methyl;
• R.sup.2 is methyl or R.sup.3 ;
• R.sup.3 is hydrogen or an acyl group of the formula ##STR21## wherein Ar is a group selected from phenyl, cyclohexadienyl, cyclohexenyl, naphthyl, thienyl, furyl, thiazolyl or pyridinyl;
• A is divalent oxygen, sulfur, sulfinyl, or sulfonyl;
• A.sup.1 is A or --NH--;
• X is hydrogen, chloro, bromo, iodo, nitro, C.sub.1 -C.sub.3 -alkyl, hydroxy, C.sub.1 -C.sub.3 -alkoxy, mercapto, C.sub.1 -C.sub.3 -alkylthio, carbamoyl, C.sub.1 -C.sub.3 -alkylcarbamoyl, C.sub.1 -C.sub.4 -alkoxycarbonyl, C.sub.1 -C.sub.4 -alkanoyl, carboxy, or R.sub.5 R.sub.6 N--;
• R.sup.4 is hydrogen, C.sub.1 -C.sub.18 -alkyl or C.sub.2 -C.sub.18 -alkenyl;
• R.sup.5 and R.sup.6 indepedently are hydrogen or C.sub.1 -C.sub.4 -alkyl, or
• R.sup.5 is hydrogen and R.sup.6 is an amino-protecting group;
• W is C.sub.1 -C.sub.10 -alkylene or C.sub.2 -C.sub.10 -alkenylene;
• n is 1 or 2;
• and
• m, p and q are 0 or 1,
• provided that:
• (1) the sum of the carbon atoms in the R.sup.4 and W groups cannot exceed 21;
• (2) when X is mercapto, A and A.sup.1 cannot be sulfinyl or sulfonyl;
• (3) when A and A.sup.1 are sulfinyl or sulfonyl, they must be in equal oxidation states;
• (4) at least one of R.sup.2 and R.sup.3 must be other than hydrogen;
• (5) if m=0, p must=0;
• and (6) when n is 2, R and R.sup.1 must be hydrogen;
• and its salts.