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 (4-pyrazol-1-ylpyridin-2-yl)-[2-[(E)-2-thiophen-2-ylethenyl]azepan-1-yl]methanone using the IUPAC nomenclature.
user
C21H22N4OS
assistant