High Quality Content by WIKIPEDIA articles! 2,5-Dihydroxy-1,4-benzoquinone or 2,5-Dihydroxy-para-benzoquinone is an organic compound with formula C6H4O4, formally derived from 1,4-Benzoquinone by replacing two hydrogen atoms with hydroxyl (OH) groups. It is one of seven dihydroxybenzoquinone isomers.