You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 1-benzyl-3-[4-[(2S,4R,6S)-4-[4-(hydroxymethyl)phenyl]-6-[[methyl-[(1R)-1-naphthalen-2-ylethyl]amino]methyl]-1,3-dioxan-2-yl]phenyl]urea by IUPAC nomenclature, provide its molecular formula.
user
C39H41N3O4
assistant