You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named 3-[[(2R)-2-(dihydroxymethyl)-3-methylbutyl]amino]-4-(1H-indol-3-ylamino)cyclobut-3-ene-1,2-dione is given. What is its corresponding molecular formula?
user
C18H21N3O4
assistant