7,8-dimethyl-3,5-diazabicyclo[4.2.0]oct-7-ene-2,4-dione

1,2,3,4-四甲基菲

1,2,3,4-四甲基蒽

1,2,2a,8b-tetramethyl-4H-cyclobuta[c]quinoline-3-thione

1,4,5,6-tetramethyl-2-thia-3-(phenylimino)bicyclo[2.2.0]hex-5-ene