You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-(1,4-diazepan-1-yl)-N-methyl-2-oxo-N-(1-thiophen-2-ylpropan-2-yl)acetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C15H23N3O2S
assistant