Task: Text Categorization
Input (English): The reversible derivatization of these compounds and separation of their functionalized intermediates is the Bingel-retro strategy. Their crystals can undergo exohedral (*) alkali-metal doping and when they enclose metal atoms they are endohedral. They can form from laser vaporization of graphite rods and often consist of pentagons and hexagons forming cages and planar sheets such as graphene. For 10 points, name this family of carbon allotropes that include nanotubes and buckyballs.
Output (English): Science