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Reaction of aromatic/heterocyclic sulfonamides possessing free amino, imino or hydrazino moieties with 7-chloro-4-chloromethylcoumarin afforded a series of N-[(7-chloro-4-coumarinyl)-methyl]- derivatives which showed effective inhibition of three carbonic anhydrase (CA) isozymes. Topical application within the rabbit eye of some of these compounds led to effective intraocular pressure lowering due...