You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[2-[cyclopentyl(methyl)amino]ethyl]-2-methyl-3-(4-methylsulfonylbutan-2-yl)guanidine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C15H32N4O2S
assistant