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 3-[(3-cyano-6-methyl-4,5,6,7-tetrahydro-1-benzothiophen-2-yl)carbamoyl]bicyclo[2.2.1]hept-5-ene-2-carboxylic acid .
user
C19H20N2O3S
assistant