Patent ID: 6909006

Claim:
A compound of formula I capable of forming a combinatorial unit: Wherein: X is an electrophilic leaving group; A and B collectively represent a fused benzene ring, which is substituted by a CO 2 H or CO 2 R group and is further optionally substituted by up to 3 groups independently selected from R, OH, OR, halo, nitro, amino, Me 3 Sn, CO 2 H, or CO 2 R, wherein Y is selected from NH-Prot, O-Prot, S-Prot, NO 2 , NHOH, N 3 , NHR, NRR, N═NR, N(O)RR, NHSO 2 R, N═NPHR, SR or SSR, where Prot represents a protecting group; R 1 is a nitrogen protecting group, where if Y includes a protecting group, these protecting groups are orthogonal; R 2 and R 7 are independently selected from H, R, OH, OR, halo, nitro, amino, or Me 3 Sn; wherein R is selected from: (a) a lower alkyl group having 1 to 10 carbon atoms, (b) an aralkyl group (i.e. an alkyl group with one or more aryl substituents), of up to 12 carbon atoms; the alkyl group of (a) or (b) optionally containing one or more carbon—carbon double or triple bonds, which may form part of a conjugated system; and (c) an aryl group, of up to 12 carbon atoms; and wherein: R is optionally substituted by one or more halo, hydroxy, amino, or nitro groups, and optionally contains one or more hetero atoms selected from the group consisting of sulfur and oxygen, which may form part of, or be, a functional group.