1-(1,4-dihydroxy-8-methoxynaphthalen-2-yl)ethanone

(4,5-dihydroxy-9,10-dioxoanthracen-2-yl)methyl acetate

9-methoxybenzo[g]quinoline-5,10-dione

5-methoxy-2-azaanthracene-9,10-dione

6-methoxybenzo[g]isoquinoline-5,10-dione