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-[4-(4,5-dihydro-1H-imidazol-2-ylamino)phenyl]-3-phenylthiourea;2,2,2-trifluoroacetic acid .
user
C18H18F3N5O2S
assistant