Patent ID: 8507480

Claim:
A method of treatment of cancer in mammals comprising administering to the mammal an amount of a compound of formula (A) or (B) or a salt, N-oxide, hydrate or solvate thereof, or a prodrug thereof effective to inhibit HSP90 activity: wherein R 1 is a group of formula (IB) wherein in any compatible combination R represents one or more optional substituents, Alk 1 and Alk 2 are optionally substituted divalent C 1 -C 6 alkylene or C 2 -C 6 alkenylene radicals, p, r and s are independently 0 or 1, Z is —O—, —S—, —(C═O)—, —(C═S)—, —SO 2 —, —C(═O)O—, —C(═O)NR A —, —C(═S)NR A —, —SO 2 NR A —, —NR A C(═O)—, —NR A SO 2 — or —NR A — wherein R A is hydrogen or C 1 -C 6 alkyl, and Q is hydrogen or an optionally substituted carbocyclic or heterocyclic radical; R 2 is (i) a group of formula (IA): —Ar 1 -(Alk 1 ) p -(Z) r -(Alk 2 ) s -Q (IA) wherein in any compatible combination Ar 1 is an optionally substituted aryl or heteroaryl radical, and Alk 1 , Alk 2 , p, r, s, Z, R A and Q are as defined in relation to R 1 ; (ii) a carboxamide radical; or (iii) a non aromatic carbocyclic or heterocyclic ring wherein a ring carbon is optionally substituted, and/or a ring nitrogen is optionally substituted by a group of formula -(Alk 1 ) p -(Z) r -(Alk 2 ) s -Q wherein Q, Alk 1 , Alk 2 , Z, p, r and s are as defined above in relation to group (IA); and R 3 is a carboxyl, carboxamide, or carboxyl ester group.