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 (1R,2S,3R,4S)-3-[[3-(cyclopentylcarbamoyl)-4-ethyl-5-methylthiophen-2-yl]carbamoyl]bicyclo[2.2.1]hept-5-ene-2-carboxylic acid .
user
C22H28N2O4S
assistant