3-ethyl-5,8-dihydroxy-2-methoxy-1,4-naphthoquinone

3-ethyl-2,4,5-trimethoxyaniline

3-ethyl-5,8-dihydroxy-3-O-(3-ethyl-5,8-dihydroxy-1,4-naphthoquinon-2-yloxy)-2-oxo-2,3-dihydro-1,4-naphthoquinone