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 (2-methylfuran-3-yl)-[7-methyl-6-(5-pyridin-2-yl-1,2,4-oxadiazol-3-yl)-2,7-diazaspiro[3.4]octan-2-yl]methanone .
user
C20H21N5O3
assistant