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 2-O-benzyl 3-O-ethyl (3S,3aS,6R,6aR)-6-methylsulfanylcarbothioyloxy-3,3a,6,6a-tetrahydro-1H-cyclopenta[c]pyrrole-2,3-dicarboxylate .
user
C20H23NO5S2
assistant