You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[2-[[2-(9H-fluoren-9-ylmethoxycarbonylamino)acetyl]amino]acetyl]-3-hydroxyazetidine-3-carboxylic acid The above is the IUPAC name of a molecule. Write its molecular formula.
user
C23H23N3O7
assistant