A compound of the formula: wherein A is a 3,3'-linked 2,2'-dimethoxy-1,1'-binaphthyl group or a 2,2'-linked 1,1'-binaphthyl group; Q is hydrogen, C 1 -C 12 straight chain, branched or cyclic alkyl substituted with one or more hydroxy groups, or a mono- or di-saccharide moiety; Z is -CR 10 R 11 -, -NR 12 -, -C O-, -C NR 12 - or -O-, where R 10 and R 11 are independently selected from hydrogen, hydroxy, C 1 -C 6 alkyl, C 6 -C 10 aryl, C 1 -C 6 alkoxy and -N(R 13) 2 and where each R 13 is independently selected from hydrogen and C 1 -C 6 alkyl, and where R 12 is selected from hydrogen and C 1 -C 6 alkyl; R 1 is selected from hydrogen, hydroxy, C 1 -C 6 alkyl, C 1 -C 6 alkoxy, -NR(R 13) 2 and -N(R 12)-COR 14; where R 12 and R 13 are as defined above, and where R 14 is selected from hydrogen, hydroxy, C 1 -C 6 alkyl, C 1 -C 6 alkoxy and -NR 12; R 2 is selected from hydrogen, hydroxy, C 1 -C 6 alkyl, C 1 -C 6 alkoxy, -N(R 13) 2 and -N(R 12)-COCHR 2a R 2b; where R 2a and R 2b are selected from hydrogen, hydroxy, C 1 -C 6 alkyl, C 1 -C 6 alkoxy, -N(R 13) 2 and -N(R 12)-COR 14; where R 12, R 13 and R 14 are as defined above; R 3, R 4 and R 5 are independently selected from hydrogen, C 1 -C 6 alkyl and α side chains of α-amino acids; R 6 is -CO 2 R 15, -CONHR 16, -CONHOR 16,-CONHNHR 16, -SO 2 N(R 16) 2, -SO 2 R 17 or -P (OR 18)(OR 18) where each R 15, R 16, R 17 and R 18 is independently selected from hydrogen, C 1 -C 6 alkyl, C 3 -C 7 cycloalkyl, C 6 -C 10 aryl and C 7 -C 10 arylalkyl; B is an α-amino acid residue, a β-amino acid residue or an α,α-disubstituted amino acid residue, such residue forming amide linkages with the adjacent molecules; W is -O- or CR 10 R 11 where R 10 and R 11 are as defined above; Y is NH 2, NH(=NH)NH 2, or salts thereof; -is a single or double bond; R 7 and R 8a are hydrogen or are absent if ------ is a double bond; and R 8b and R 9 are hydrogen, and X is selected from (CR 10 R 11) u, -(CR 10 R 11) u -CH=CH-, -NR 12 (CR 10 R 11) u NR 12 -, -O(CR 10 R 11) u -, -(CR 10 R 11) u O- or -O(CR 10 R 11)CH=CH- where R 10, R 11 and R 12 are as defined above; or R 8b and R 9 together form a covalent bond between X and the carbon to which R 8b is attached, and X is selected from (CR 10 R 11) x, -NR 12 (CR 10 R 11) x -, -(CR 10 R 11) x -, -(CR 10 R 11) x NR 12 -, -O(CR 10 R 11) x - or -(CR 10 R 11) x O-, where R 10, R 11 and R 12 are as defined above; n, m, r and t are independently selected from 0 or 1; s is an integer selected from 0 to 3; p is an integer selected from 0 to 6, provided that when W is -O-, p is at least 1; and u, x and q are is independently selected from 0 to 4; and salts thereof. A is a 3,3'-linked 2,2'-dimethoxy-1,1'-binaphthyl group or a 2,2'-linked 1,1'-binaphthyl group; Q is hydrogen, C 1 -C 12 straight chain, branched or cyclic alkyl substituted with one or more hydroxy groups, or a mono- or di-saccharide moiety; Z is -CR 10 R 11 -, -NR 12 -, -C O-, -C NR 12 - or -O-, where R 10 and R 11 are independently selected from hydrogen, hydroxy, C 1 -C 6 alkyl, C 6 -C 10 aryl, C 1 -C 6 alkoxy and -N(R 13) 2 and where each R 13 is independently selected from hydrogen and C 1 -C 6 alkyl, and where R 12 is selected from hydrogen and C 1 -C 6 alkyl; R 1 is selected from hydrogen, hydroxy, C 1 -C 6 alkyl, C 1 -C 6 alkoxy, -NR(R 13) 2 and -N(R 12)-COR 14; where R 12 and R 13 are as defined above, and where R 14 is selected from hydrogen, hydroxy, C 1 -C 6 alkyl, C 1 -C 6 alkoxy and -NR 12; R 2 is selected from hydrogen, hydroxy, C 1 -C 6 alkyl, C 1 -C 6 alkoxy, -N(R 13) 2 and -N(R 12)-COCHR 2a R 2b; where R 2a and R 2b are selected from hydrogen, hydroxy, C 1 -C 6 alkyl, C 1 -C 6 alkoxy, -N(R 13) 2 and -N(R 12)-COR 14; where R 12, R 13 and R 14 are as defined above; R 3, R 4 and R 5 are independently selected from hydrogen, C 1 -C 6 alkyl and α side chains of α-amino acids; R 6 is -CO 2 R 15, -CONHR 16, -CONHOR 16,-CONHNHR 16, -SO 2 N(R 16) 2, -SO 2 R 17 or -P (OR 18)(OR 18) where each R 15, R 16, R 17 and R 18 is independently selected from hydrogen, C 1 -C 6 alkyl, C 3 -C 7 cycloalkyl, C 6 -C 10 aryl and C 7 -C 10 arylalkyl; B is an α-amino acid residue, a β-amino acid residue or an α,α-disubstituted amino acid residue, such residue forming amide linkages with the adjacent molecules; W is -O- or CR 10 R 11 where R 10 and R 11 are as defined above; Y is NH 2, NH(=NH)NH 2, or salts thereof; -is a single or double bond; R 7 and R 8a are hydrogen or are absent if ------ is a double bond; and R 8b and R 9 are hydrogen, and X is selected from (CR 10 R 11) u, -(CR 10 R 11) u -CH=CH-, -NR 12 (CR 10 R 11) u NR 12 -, -O(CR 10 R 11) u -, -(CR 10 R 11) u O- or -O(CR 10 R 11)CH=CH- where R 10, R 11 and R 12 are as defined above; or R 8b and R 9 together form a covalent bond between X and the carbon to which R 8b is attached, and X is selected from (CR 10 R 11) x, -NR 12 (CR 10 R 11) x -, -(CR 10 R 11) x -, -(CR 10 R 11) x NR 12 -, -O(CR 10 R 11) x - or -(CR 10 R 11) x O-, where R 10, R 11 and R 12 are as defined above; n, m, r and t are independently selected from 0 or 1; s is an integer selected from 0 to 3; p is an integer selected from 0 to 6, provided that when W is -O-, p is at least 1; and u, x and q are is independently selected from 0 to 4;