2,6-Dichloroquinone-4-chloroimide101-38-2100 % similar 2,6-Dichloro-1,4-benzoquinone697-91-652 % similar 2,6-Dichloroindophenol sodium620-45-141 % similar 2,5-Dichloro-1,4-benzoquinone615-93-035 % similar