Definition and Etiology. Primary sclerosing cholangitis (PSC) is a chronic, progressive, cholestatic liver disease resulting from inflammation, fibrosis, and destruction of the intrahepatic and extrahepatic bile ducts. This leads to multiple areas of stricturing in the biliary tree and eventually to cirrhosis.
Octinoxate is a chemical compound that is found in many different types of cosmetics and personal care products. Manufacturers derive this ingredient from petroleum by-products, then add it to makeup, lotion and moisturizers.unscreen products containing octinoxate may reduce freckles. Octinoxate is used in some lipsticks and other cosmetics to provide protection from the sun. Octinoxate is found in most sunscreen products. Octinoxate is made from methanol and sulfuric acid.
This can be either a molecular or empirical formula. Basically a chemical formula gives scientists a variety of information about a particular compound. Let's look at iso-octane. Iso-octane is the component of gasoline that burns the smoothest. Iso-octane can be written in numerous ways. 1  Structural Formula. 2  Like the other formulas mentioned below, the structural formula tells us which atoms are in a given molecule. 3  But, this type of formula also gives us information about the way those atoms are connected to one another.