Input (grade 13): Copper (II) carbonate (often called copper carbonate or cupric carbonate) is a blue-green compound (chemical formula CuCO3) forming part of the verdigris patina that is found on weathered brass, bronze, and copper.
Output (grade 9): Copper (II) carbonate, also known as cupric carbonate, is a chemical compound. Its chemical formula is CuCO3.