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 1-(4,6-dimethyl-2,2-diphenyl-1-oxa-3-azonia-2-boranuidacyclohexa-3,5-dien-5-yl)ethanone;methyl(methylimino)borane .
user
C21H26B2N2O2
assistant