You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named (2S)-2-[[5-(butylamino)-1,3,4-thiadiazol-2-yl]sulfanyl]-N-ethylpropanamide is given. What is its corresponding molecular formula?
user
C11H20N4OS2
assistant