You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[[2-[(4-fluorophenoxy)methyl]-4-methyl-1,3-thiazole-5-carbonyl]amino]-4-methylpentanoic acid The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H21FN2O4S
assistant