You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-(3-indol-1-ylpropyl)-2-methyl-3-[(5-methyl-1,3-thiazol-2-yl)methyl]guanidine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H23N5S
assistant