You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance (2R)-2,5-diamino-N-[(2R)-1-(4-chloro-1,3-benzoxazol-2-yl)-1-hydroxy-4-phenylbutan-2-yl]pentanamide .
user
C22H27ClN4O3
assistant