You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-(3-aminoprop-1-ynyl)-4-methyl-N-[1-oxo-1-(propan-2-ylamino)propan-2-yl]thiophene-2-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C15H21N3O2S
assistant