These hydrocarbons are produced when molecules containing carbon are heated to high temperatures. By themselves, PAHs are definitely not a reliable indicator of life. These were found in surface textures and internal structures of selected carbonate globules. Magnetite is a magnetic compound of iron and oxygen that can be found in bacteria and many other living creatures and left behind after they die. The vast bulk of magnetite is formed inorganically.
Iron sulfide is similar.
Life is not required to form either of these compounds. However, magnetite forms in oxygen, while iron sulfide forms where there is no oxygen. Therefore, researchers believe that finding these two elements together suggests an organic source. The meteorite is sterile. No PAHs were found on the surface of the rock.