...Bill Clinton announced yesterday that his foundation had negotiated deep price reductions for generic versions of costly, second-line AIDS drugs...as well as for less toxic, easier-to-use first-line medicines...Mr. Clinton also forcefully endorsed recent decisions by Thailand and Brazil to break patents held by American pharmaceutical companies...The new prices would halve the cost of the drugs for better-off developing countries in Latin America and Asia and cut prices by 25 percent in poor countries, which were already paying lower prices, the foundation said...[refers to Abbott Laboratories, Cipla, Matrix, Merck]