You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-(2-hydroxyethyl)-4-(4-methyl-2-oxo-1,3-thiazol-3-yl)-N-pentan-3-ylbutanamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C15H26N2O3S
assistant