How is 2-{[(9H-Fluoren-9-ylmethoxy)carbonyl]amino}benzoic acid (CAS: 150256-42-1) typically synthesized?

2-{[(9H-Fluoren-9-ylmethoxy)carbonyl]amino}benzoic acid is typically synthesized by reacting fluoren-9-ylmethanol with benzoic anhydride in the presence of a catalytic amount of a suitable acid, such as sulfuric acid. The reaction involves the formation of an ester followed by the introduction of an amino group. The yield is generally high, and the product can be purified by recrystallization from appropriate solvents.