C10H8O4 is the chemical formula for a compound known as phthalic acid. It consists of ten carbon (C) atoms, eight hydrogen (H) atoms, and four oxygen (O) atoms. This compound is commonly used in the production of plasticizers, which are substances added to plastics to increase their flexibility and durability. Phthalic acid is also a precursor for the synthesis of various dyes and pigments. It can be found in some household products, including certain types of adhesives and coatings. Its derivatives, such as dimethyl phthalate, are often used in cosmetics and personal care items.