You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4E)-3-(furan-2-yl)-4-[[3-(pyrrolidin-1-ylmethyl)-4,5,6,7-tetrahydro-1H-indol-2-yl]methylidene]-1H-pyrazol-5-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H24N4O2
assistant