You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 1-[(1S,2S,4R)-2-bicyclo[2.2.1]hept-5-enyl]-3-[3-(4-methoxyphenoxy)propanoylamino]thiourea into its molecular formula.
user
C18H23N3O3S
assistant