You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (Z)-3-[(Z)-[(1R,2S,4R)-2-bicyclo[2.2.1]hept-5-enyl]methylideneamino]-4-(2,5-dimethoxyphenyl)-N-ethyl-1,3-thiazol-2-imine by IUPAC nomenclature, provide its molecular formula.
user
C21H25N3O2S
assistant