You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[3-(2,5-dioxopyrrol-1-yl)propyl]-3-(7-methyl-3,5,9,11,14,16-hexazabicyclo[5.5.5]heptadecan-1-yl)thiourea The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H37N9O2S
assistant