Another important method of drug discovery is the random screening of vast numbers of compounds OH Taxol Fig 14. 4 originally isolated from the bark of the pacific yew tree, Taxol is a complex natural product useful in the treatment of various forms of cancerAnother important method of drug discovery is the random screening of vast numbers of compounds. N OH H O O O O O O O O OH O OH O Taxol Fig 14.4 originally isolated from the bark of the pacific yew tree, Taxol is a complex natural product useful in the treatment of various forms of cancer