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-(2-methoxy-5-methylphenyl)-4-(6-thiophen-2-ylpyridazin-3-yl)piperazine-1-carboxamide using the IUPAC nomenclature.
user
C21H23N5O2S
assistant