You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(5-tert-butyl-1H-pyrazol-3-yl)-[3-[(3-cyclopropyl-[1,2,4]triazolo[4,3-b]pyridazin-6-yl)oxymethyl]pyrrolidin-1-yl]methanone The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H27N7O2
assistant