 The most common oxide is the volatile colourless Re2O7 . Rhenium trioxide ReO3 adopts a perovskite @-@ like structure . Other oxides include Re2O5 , ReO2 , and Re2O3 . The sulfides are ReS2 and Re2S7 . Perrhenate salts can be converted to tetrathioperrhenate by the action of ammonium hydrosulfide . 
