You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Name the molecular formula for the molecule established as N-[1-(2,5-dimethylthiophen-3-yl)ethyl]-5-fluoro-2-hydrazinylpyrimidin-4-amine using the IUPAC nomenclature.
user
C12H16FN5S
assistant