You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-[2-(3-butyl-5-methyl-1,2-oxazol-4-yl)ethenyl]-N-(2-hydroxyethyl)-1,2-oxazole-5-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C16H21N3O4
assistant