Tetraoxygen (O4), or oxozone, is a molecule made up of four oxygen atoms. It does not exist in nature anywhere and can only be made under extreme conditions in a lab. The molecule was first created in a lab in 2001.[1]


  1. Oda, Tatsuki; Alfredo Pasquarello (2004). "Noncollinear magnetism in liquid oxygen: A first-principles molecular dynamics study". Physical Review B. 70 (134402): 1–19. Bibcode:2004PhRvB..70m4402O. doi:10.1103/PhysRevB.70.134402. hdl:2297/3462.