Combinatorial libraries are disclosed which are represented by Formula I: (T′—L)q—Ŝ—C(O)—L′—II′  I wherein: Ŝ is a solid support; T′—L— is an identifier residue; and —L′—II′ is a ligand/linker residue. These libraries contain dihydrobenzopyrans of the formula: which interact (i.e., as agonists or antagonists) with &agr; adrenergic receptors, dopamine receptors, &dgr;-opiate receptors, and K+ channels and are inhibitors of carbonic anhydrase isozymes. They are useful in the treatement of ocular diseases such as glaucoma.