You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 2-[2-(furan-2-yl)-5-methyl-1,3-oxazol-4-yl]-N-[(1R,2R)-2-imidazol-1-ylcyclopentyl]acetamide by IUPAC nomenclature, provide its molecular formula.
user
C18H20N4O3
assistant