You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 1-[(5-chlorothiophen-2-yl)methyl]-3-ethyl-1-methyl-2-[3-(6,7,8,9-tetrahydro-5H-[1,2,4]triazolo[4,3-a]azepin-3-yl)propyl]guanidine .
user
C19H29ClN6S
assistant