Xigris is a brand name for a drug composed of activated drotrecogin alfa, manufactured by Eli Lilly to treat severe sepsis. Its active ingredient is activated Protein C.

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... DROTRECOGIN ALFA (Xigris™) is used to treat sepsis, a serious reaction to an infection. Sepsis is a condition where the body''s response to an infection causes damage to other organs such as the lungs, liver, or kidneys. Drotrecogin alfa is a man-made product that is similar to a natural substance found in your body called activated protein C. It acts to bring the sepsis reaction under control. Generic drotrecogin injections are not available. ...
Drug Digest - more...

Image:Drotrecogin alfa.png Drotrecogin alfa Systematic (IUPAC) name ...
Wikipedia - [full article]

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