You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance (1R,9S,13R)-4,6-dichloro-N,N,9-trimethyl-10-(3-methylphenyl)-11-sulfanylidene-8-oxa-10,12-diazatricyclo[7.3.1.02,7]trideca-2(7),3,5-triene-13-carboxamide .
user
C21H21Cl2N3O2S
assistant