You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[[5-[(9H-fluoren-9-ylmethoxycarbonylamino)methyl]-1,3-oxazole-4-carbonyl]-methylamino]oxyacetic acid The above is the IUPAC name of a molecule. Write its molecular formula.
user
C23H21N3O7
assistant