You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 6-[1-[(3S)-3-amino-3-carboxypropanoyl]azetidin-3-yl]oxy-3-(2-boronoethyl)-2-hydroxybenzoic acid into its molecular formula.
user
C16H21BN2O9
assistant