Instructions: In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.
Input: The Gatterman-Koch reaction adds carbonyl groups to derivatives of this molecule, which when substituted with a hydroxyl group can undergo the Pechmann condensation to synthesize coumarins. The ANRORC mechanism is used to describe certain types of nucleophilic substitutions in it, and reacting it with sodium and an alcohol in liquid ammonia will selectively reduce it in a reaction named for Birch. It readily undergoes the Lewis acid-catalyzed Friedel-Crafts acylation, and simple derivatives of it include aniline and toluene. For 10 points, identify this chemical compound with molecular formula C6H6, whose structure was elucidated by Kekul.
Output:
Science