You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-methyl-1-(oxolan-2-ylmethyl)-3-[2-(2-propan-2-yl-1,3-thiazol-4-yl)ethyl]guanidine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C15H26N4OS
assistant