Keywords: Ovalene (1).png CS ChemDraw zh wikipedia 2005-12-17 ParadiseW wikipedia zh This image is in the public domain original upload log page zh wikipedia Ovalene png 2005-12-17 21 29 ParadiseW 307×229×8 3960 bytes <nowiki> GFDL CS ChemDraw </nowiki> Chemical Polycyclic aromatic hydrocarbons |