The molecule is a member of the class of bianthracenes resulting from the oxidative dimerisation of emodin between position 4 of one molecule and position 5 of the other. It derives from an emodin.
2,4,5-trihydroxy-7-methyl-1-(4,5,7-trihydroxy-2-methyl-9,10-dioxoanthracen-1-yl)anthracene-9,10-dione