You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-(1,3-dimethylpyrazolo[3,4-b]pyridin-5-yl)-3-[(5-ethylthiophen-2-yl)methyl]urea The above is the IUPAC name of a molecule. Write its molecular formula.
user
C16H19N5OS
assistant