You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
7-(2-chlorophenyl)-4-ethyl-9-methoxy-N-methyl-3-thia-1,8,11,13-tetrazatricyclo[8.3.0.02,6]trideca-2(6),4,7,10,12-pentaene-12-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H18ClN5O2S
assistant