1-carbomethoxy-10-cyano-8,9-dihydro-9-ethyl-6-hydroxy-7-oxo-5,12-naphthacenedione

1-t-butoxycarbonyl-1-cyano-2,3-dihydro-2-ethyl-4-ketobenzanthra-7,12-quinone

1-Hydroxy-2-((E)-pent-2-enoyl)-anthraquinone