You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-(3-chlorophenyl)-N-[(2-morpholin-4-ylpyridin-3-yl)methyl]-1,2-oxazole-3-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H19ClN4O3
assistant