<qa>  What is the name of the drug known as?The purpose of this study is to evaluate the effects of a drug known as CS-747 also known as prasugrel on subjects having a procedure called a percutaneous coronary intervention also referred to as PCI in which a doctor will attempt to open a blocked vessel or vessels in the heart using a catheter a long thin tube that has a small balloon on the end. In many cases, patients who have this procedure receive a stent, a small wire spring that helps keep the vessel open. 