You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-ethyl-1-methyl-1-[(2-methyl-1,3-thiazol-4-yl)methyl]-2-[3-(1,3-thiazol-2-ylsulfanyl)propyl]guanidine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C15H23N5S3
assistant