A compound of formula wherein - Gln is glutamine; - R is selected in the group consisting of a C 1-12 -alkyl group optionally substituted by a C 6-10 -aryl group, a C 2-12 -alkenyl group optionally substituted by a C 6-10 -aryl group, a C 3-6 -cycloalkyl group, a C 6-10 -aryl group optionally substituted by a C 1-4 -alkyl, and a C 1-5 -alkyl-(O-CH 2 -CH 2) t - group with t being an integer from 0 to 20 inclusive; - R 1 is the side chain of arginine or lysine; - R 2 is a -(CH 2)-C 3-6 -cycloalkyl group; - R 3 is selected in the group consisting of a C 1-8 -alkyl group, the side chain of arginine or lysine, -(CH 2) q -CO 2 R 7a, -(CH 2) q -CO-NHR 7b, -CH 2 OR 8 and -(CH 2) q NHR 9, wherein - q is 1, 2, 3 or 4, - R 7a is a hydrogen atom, a C 1-8 -alkyl group, a C 4-12 -alkylene group forming together with R 6 a lactone or a polyether ring, or a C 4-12 -alkenylene, forming together with R 6 a lactone or a polyether ring, - R 7b is a hydrogen atom, a C 1-8 -alkyl group, or -(CH 2) q' -NH- with q' being an integer between 2 and 8 inclusive and forming together with R 6 a lactam, - R 8 is a hydrogen atom, a C 1-8 -alkyl group, a C 4-12 -alkylene group forming together with R 6 a lactone or a polyether ring, or a C 4-12 -alkenylene, forming together with R 6 a lactone or a polyether ring, - R 9 is a hydrogen atom, or R 9 together with R 6 form a lactam; - R 4 is a C 1-8 -alkyl group optionally substituted by a C 3-6 -cycloalkyl group, or a halogen-C 1-4 -alkyl group; - R 5 is a -(CH 2)-C 6-10 -aryl group optionally substituted by a halogen, a C 1-2 alkyl group and/or a C 1-2 alkoxy group; - when r is 0, 1 or 2, R 6 is -CO 2 H, -CO 2 R 10, -CO-NH 2, -CO-NHR 10, or R 6 is -CO-, -CO-O- or -O- and forms a lactam, a lactone, or a polyether ring with R 7a, R 7b, R 8 or R 9; - when r is 1 or 2, R 6 is -OR 10 or -NH-CO-NHR 10; wherein - R 10 is a C 1-8 -alkyl group optionally substituted by a C 6-10 -aryl group; a C 3-6 -cycloalkyl group; a C 6-10 -aryl group optionally substituted by a halogen, a C 1-2 -alkyl group and/or a C 1-2 -alkoxy group; - m is 0 or 1; - n is 0; - p is an integer from 0 to 10 inclusive; - r is 0, 1 or 2. - Gln is glutamine; - R is selected in the group consisting of a C 1-12 -alkyl group optionally substituted by a C 6-10 -aryl group, a C 2-12 -alkenyl group optionally substituted by a C 6-10 -aryl group, a C 3-6 -cycloalkyl group, a C 6-10 -aryl group optionally substituted by a C 1-4 -alkyl, and a C 1-5 -alkyl-(O-CH 2 -CH 2) t - group with t being an integer from 0 to 20 inclusive; - R 1 is the side chain of arginine or lysine; - R 2 is a -(CH 2)-C 3-6 -cycloalkyl group; - R 3 is selected in the group consisting of a C 1-8 -alkyl group, the side chain of arginine or lysine, -(CH 2) q -CO 2 R 7a, -(CH 2) q -CO-NHR 7b, -CH 2 OR 8 and -(CH 2) q NHR 9, wherein - q is 1, 2, 3 or 4, - R 7a is a hydrogen atom, a C 1-8 -alkyl group, a C 4-12 -alkylene group forming together with R 6 a lactone or a polyether ring, or a C 4-12 -alkenylene, forming together with R 6 a lactone or a polyether ring, - R 7b is a hydrogen atom, a C 1-8 -alkyl group, or -(CH 2) q' -NH- with q' being an integer between 2 and 8 inclusive and forming together with R 6 a lactam, - R 8 is a hydrogen atom, a C 1-8 -alkyl group, a C 4-12 -alkylene group forming together with R 6 a lactone or a polyether ring, or a C 4-12 -alkenylene, forming together with R 6 a lactone or a polyether ring, - R 9 is a hydrogen atom, or R 9 together with R 6 form a lactam; - q is 1, 2, 3 or 4, - R 7a is a hydrogen atom, a C 1-8 -alkyl group, a C 4-12 -alkylene group forming together with R 6 a lactone or a polyether ring, or a C 4-12 -alkenylene, forming together with R 6 a lactone or a polyether ring, - R 7b is a hydrogen atom, a C 1-8 -alkyl group, or -(CH 2) q' -NH- with q' being an integer between 2 and 8 inclusive and forming together with R 6 a lactam, - R 8 is a hydrogen atom, a C 1-8 -alkyl group, a C 4-12 -alkylene group forming together with R 6 a lactone or a polyether ring, or a C 4-12 -alkenylene, forming together with R 6 a lactone or a polyether ring, - R 9 is a hydrogen atom, or R 9 together with R 6 form a lactam; - R 4 is a C 1-8 -alkyl group optionally substituted by a C 3-6 -cycloalkyl group, or a halogen-C 1-4 -alkyl group; - R 5 is a -(CH 2)-C 6-10 -aryl group optionally substituted by a halogen, a C 1-2 alkyl group and/or a C 1-2 alkoxy group; - when r is 0, 1 or 2, R 6 is -CO 2 H, -CO 2 R 10, -CO-NH 2, -CO-NHR 10, or R 6 is -CO-, -CO-O- or -O- and forms a lactam, a lactone, or a polyether ring with R 7a, R 7b, R 8 or R 9; - when r is 1 or 2, R 6 is -OR 10 or -NH-CO-NHR 10; wherein - R 10 is a C 1-8 -alkyl group optionally substituted by a C 6-10 -aryl group; a C 3-6 -cycloalkyl group; a C 6-10 -aryl group optionally substituted by a halogen, a C 1-2 -alkyl group and/or a C 1-2 -alkoxy group; - R 10 is a C 1-8 -alkyl group optionally substituted by a C 6-10 -aryl group; a C 3-6 -cycloalkyl group; a C 6-10 -aryl group optionally substituted by a halogen, a C 1-2 -alkyl group and/or a C 1-2 -alkoxy group; - m is 0 or 1; - n is 0; - p is an integer from 0 to 10 inclusive; - r is 0, 1 or 2.