You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
ethyl (5S,6S,7R)-2-(benzotriazol-1-ylmethylcarbamoyl)-3-(2-hydroxyethyl)-4-oxo-10-thia-3-azatricyclo[5.2.1.01,5]decane-6-carboxylate is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H25N5O5S
assistant