6-Ethyl-1,2,3,4-tetrahydro-9,10-anthracenediol

5,6,7,8-Tetrahydro-2-ethylanthracene-9,10-diol

2-Ethyl-5,6,7,8-tetrahydroanthracene-9,10-diol

2-Ethyl-5,6,7,8-tetrahydro-9,10-anthracenediol

6-ethyl-1,2,3,4-tetrahydroanthracene-9,10-diol