You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule (1S,9R,13S)-4-methoxy-N,N,9-trimethyl-10-phenyl-11-sulfanylidene-8-oxa-10,12-diazatricyclo[7.3.1.02,7]trideca-2(7),3,5-triene-13-carboxamide ?
user
C21H23N3O3S
assistant