You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[(1S,2R)-2-hydroxy-2,3-dihydro-1H-inden-1-yl]-3-propan-2-yloxypyridine-2-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H20N2O3
assistant