Chemical element named mendelevium in honor of D.I. Mendeleev, the first to arrange the elements in a periodic manner. Most recently, the synthesis of element 118 (since named oganesson) was reported in October 2006, and the synthesis of element 117 (tennessine) was reported in April 2010. Ten materials familiar to various prehistoric cultures are now known to be chemical elements: Carbon, copper, gold, iron, lead, mercury, silver, sulfur, tin, and zinc. Three additional materials now accepted as elements, arsenic, antimony, and bismuth, were recognized as distinct substances prior to 1500 AD. Phosphorus, cobalt, and platinum were isolated before 1750. Most of the
CU-2010 and CU-2020 CU-2010 and CU-2020 CU-2010 and CU-2020 are synthetic compounds that act as serine protease inhibitors. These were developed in 2010 to replace the use of aprotinin during and after cardiac surgery, including surgeries with cardiopulmonary bypass which cause blood loss and hemorrhagic complications. CU-2010 and CU-2020 were developed to avoid many issues associated with the use of aprotinin, including the risk of an allergic reaction and infection. Since the isolation of aprotinin is expensive, a drug with a simpler synthesis was desired. CU-2010 has a molecular weight of 700 Da and binds to the active site of serine proteases, like