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-(3,4-dihydro-2H-1,5-benzodioxepin-7-yl)-2-[[6-(dimethylamino)pyridin-2-yl]methyl]guanidine .
user
C18H23N5O2
assistant