You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule N-(3-acetylphenyl)-2-[[6-(4-ethylphenyl)-[1,2,4]triazolo[4,3-b]pyridazin-3-yl]sulfanyl]acetamide .
user
C23H21N5O2S
assistant