You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 1-[2-[[6-(1-hydroxyethyl)-1,3-benzoxazol-2-yl]methyl]-1-methylbenzimidazol-5-yl]ethanone into its molecular formula.
user
C20H19N3O3
assistant