6,7-dichloro-2-ethoxy-3-ethyl-5,8-dihydroxy-1,4-naphthoquinone

2-ethyl-5,8-dihydroxy-3,6,7-trimethoxy-[1,4]naphthoquinone

7-ethyl-5,6,8-trimethoxyquinoline N-oxide

7-ethyl-5,6,8-trimethoxy-2(1H)-quinolinone

7-Ethyl-5,6,8-trimethoxy-1-methyl-1H-quinolin-2-one