You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 2-(4-ethyl-4-methyl-2,5-dioxoimidazolidin-1-yl)-N-(3-hydroxy-2-methylpropyl)acetamide by IUPAC nomenclature, provide its molecular formula.
user
C12H21N3O4
assistant