You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 1-[1-(3,5-dimethoxyphenyl)pyrrolidin-3-yl]-3-ethyl-2-[(3-hydroxythiolan-3-yl)methyl]guanidine .
user
C20H32N4O3S
assistant