18964-31-3 4,5-Dichloro-2-(dichloromethylene)-4-cyclopentene-1,3-dione 4-07-00-02087 (Beilstein Handbook Reference) 4-Cyclopentene-1,3-dione, 4,5-dichloro-2-(dichloromethylene)- BRN 2092813 Diketone