You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2R)-2-[[2-[(4-chlorophenyl)sulfonyl-methylamino]acetyl]-[(2-fluorophenyl)methyl]amino]-N-ethyl-3-phenylpropanamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C27H29ClFN3O4S
assistant