For 10 points, name this class of compounds exemplified by benzene.
A protein that confers this characteristic to androgens is inhibited by the drug Exemestane, which is used to treat breast cancer. An aluminum chloride catalyst is used in a set of reactions which substitutes these compounds, and one of those reactions is often followed up with a Clemmensen reduction. Cyclopentadiene is highly acidic because losing a proton would make it into one of these compounds, and cyclo-octa-tetra-ene would be expected to have the opposite form of this property. This property is governed by Hückel's rule, and adding a hydroxyl group to one of these compounds produces phenol. For 10 points, name this class of compounds exemplified by benzene.
A protein that confers this characteristic to androgens is inhibited by the drug Exemestane, which is used to treat breast cancer.
aromatic [accept word forms like aromaticity]