6,13-dihydro-pentacene-5,7,12,14-tetraol

3-benzoyl-1,4-dihydroxy-9,10-dioxo-9,10-dihydro-anthracene-2-carboxylic acid

2,4-二甲基二苯甲酮

(5-benzoyl-2,4-dimethylphenyl)-phenylmethanone

对苯二酚