A compound of formula or a salt thereof, wherein: P is a tag or label; D is cyclyl or -(C 1-4 alkylene)-cyclyl, wherein cyclyl and the cyclyl moiety in the -(C 1-4 alkylene)-cyclyl are each optionally substituted; L 1 is a divalent C 6 - 90 hydrocarbon group, wherein one or more carbon atoms comprised in said hydrocarbon group are each optionally replaced by a heteroatom selected independently from O, S and N, wherein one or more carbon atoms comprised in said hydrocarbon group are each optionally replaced by a group selected independently from the group consisting of -C(=O)-, - NR 1 -, -NR 1 -C(=O)-, -C(=O)-NR 1 -, -NR 1 -C(=O)-NR 1 -, -NR 1 -C(=S)-NR 1 -, -O-C(=O)-NR 1 -, -NR 1 -C(=O)-O-, -C(=O)-O-, -O-C(=O)-, -SO 2 -NR 1 - and -NR 1 -SO 2 -, and wherein L 1 provides a distance of at least 3 atoms between P and X 1; R 1 is hydrogen or C 1-4 alkyl; X 1 is -C(=O)-, -NR 1 -, -NR 1 -C(=O)-, -C(=O)-NR 1 -, -NR 1 -C(=O)-NR 1 -, -NR 1 -C(=S)-NR 1 -, -O-C(=O)-NR 1 -, -NR 1 -C(=O)-O-, -C(=O)-O-, -O-C(=O)-, -SO 2 -NR 1 -, -NR 1 -SO 2 - or -O-; X 2 is C 0-5 alkylene; one of Z 1 and Z 2 is CH or N, and the other of Z 1 and Z 2 is CH; s and t are each independently selected from 0, 1 and 2; R 5 and R 6 are at each occurrence independently selected from C 14 alkyl, halo, -NH 2, -NR a R c, - CN, -OH, -OR c, haloC 1-4 alkyl, cyclyl, cyclylC 1-4 alkyl-, C 1-4 alkyl-O-C 1-4 alkyl; R a is selected from hydrogen, C 14 alkyl and haloC 1-4 alkyl; R c is independently selected from C 1-4 alkyl, haloC 1-4 alkyl, cyclyl, cyclylC 1-4 alkyl-, and C 1-4 alkyl-O-C 1-4 alkyl; and wherein the phenyl and -NH-D groups on the cyclopropyl ring are in trans configuration. or a salt thereof, wherein: P is a tag or label; D is cyclyl or -(C 1-4 alkylene)-cyclyl, wherein cyclyl and the cyclyl moiety in the -(C 1-4 alkylene)-cyclyl are each optionally substituted; L 1 is a divalent C 6 - 90 hydrocarbon group, wherein one or more carbon atoms comprised in said hydrocarbon group are each optionally replaced by a heteroatom selected independently from O, S and N, wherein one or more carbon atoms comprised in said hydrocarbon group are each optionally replaced by a group selected independently from the group consisting of -C(=O)-, - NR 1 -, -NR 1 -C(=O)-, -C(=O)-NR 1 -, -NR 1 -C(=O)-NR 1 -, -NR 1 -C(=S)-NR 1 -, -O-C(=O)-NR 1 -, -NR 1 -C(=O)-O-, -C(=O)-O-, -O-C(=O)-, -SO 2 -NR 1 - and -NR 1 -SO 2 -, and wherein L 1 provides a distance of at least 3 atoms between P and X 1; R 1 is hydrogen or C 1-4 alkyl; X 1 is -C(=O)-, -NR 1 -, -NR 1 -C(=O)-, -C(=O)-NR 1 -, -NR 1 -C(=O)-NR 1 -, -NR 1 -C(=S)-NR 1 -, -O-C(=O)-NR 1 -, -NR 1 -C(=O)-O-, -C(=O)-O-, -O-C(=O)-, -SO 2 -NR 1 -, -NR 1 -SO 2 - or -O-; X 2 is C 0-5 alkylene; one of Z 1 and Z 2 is CH or N, and the other of Z 1 and Z 2 is CH; s and t are each independently selected from 0, 1 and 2; R 5 and R 6 are at each occurrence independently selected from C 14 alkyl, halo, -NH 2, -NR a R c, - CN, -OH, -OR c, haloC 1-4 alkyl, cyclyl, cyclylC 1-4 alkyl-, C 1-4 alkyl-O-C 1-4 alkyl; R a is selected from hydrogen, C 14 alkyl and haloC 1-4 alkyl; R c is independently selected from C 1-4 alkyl, haloC 1-4 alkyl, cyclyl, cyclylC 1-4 alkyl-, and C 1-4 alkyl-O-C 1-4 alkyl; and wherein the phenyl and -NH-D groups on the cyclopropyl ring are in trans configuration. P is a tag or label; D is cyclyl or -(C 1-4 alkylene)-cyclyl, wherein cyclyl and the cyclyl moiety in the -(C 1-4 alkylene)-cyclyl are each optionally substituted; L 1 is a divalent C 6 - 90 hydrocarbon group, wherein one or more carbon atoms comprised in said hydrocarbon group are each optionally replaced by a heteroatom selected independently from O, S and N, wherein one or more carbon atoms comprised in said hydrocarbon group are each optionally replaced by a group selected independently from the group consisting of -C(=O)-, - NR 1 -, -NR 1 -C(=O)-, -C(=O)-NR 1 -, -NR 1 -C(=O)-NR 1 -, -NR 1 -C(=S)-NR 1 -, -O-C(=O)-NR 1 -, -NR 1 -C(=O)-O-, -C(=O)-O-, -O-C(=O)-, -SO 2 -NR 1 - and -NR 1 -SO 2 -, and wherein L 1 provides a distance of at least 3 atoms between P and X 1; R 1 is hydrogen or C 1-4 alkyl; X 1 is -C(=O)-, -NR 1 -, -NR 1 -C(=O)-, -C(=O)-NR 1 -, -NR 1 -C(=O)-NR 1 -, -NR 1 -C(=S)-NR 1 -, -O-C(=O)-NR 1 -, -NR 1 -C(=O)-O-, -C(=O)-O-, -O-C(=O)-, -SO 2 -NR 1 -, -NR 1 -SO 2 - or -O-; X 2 is C 0-5 alkylene; one of Z 1 and Z 2 is CH or N, and the other of Z 1 and Z 2 is CH; s and t are each independently selected from 0, 1 and 2; R 5 and R 6 are at each occurrence independently selected from C 14 alkyl, halo, -NH 2, -NR a R c, - CN, -OH, -OR c, haloC 1-4 alkyl, cyclyl, cyclylC 1-4 alkyl-, C 1-4 alkyl-O-C 1-4 alkyl; R a is selected from hydrogen, C 14 alkyl and haloC 1-4 alkyl; R c is independently selected from C 1-4 alkyl, haloC 1-4 alkyl, cyclyl, cyclylC 1-4 alkyl-, and C 1-4 alkyl-O-C 1-4 alkyl; and wherein the phenyl and -NH-D groups on the cyclopropyl ring are in trans configuration.