You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-(2,2-diethyl-4-hydroxybutyl)-1-ethyl-3-[2-(2-ethyl-1,3-thiazol-4-yl)ethyl]guanidine is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H34N4OS
assistant