You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[6-[(6-cyclopropyl-[1,2,4]triazolo[4,3-b]pyridazin-3-yl)sulfanyl]-1,3-benzothiazol-2-yl]-2-morpholin-4-ylacetamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H21N7O2S2
assistant