You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
ethyl 5-propan-2-yl-2-[[2-[3-(tetrazol-1-yl)phenoxy]acetyl]amino]thiophene-3-carboxylate is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H21N5O4S
assistant