You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named [2'-(2-deuteriopropan-2-yl)-22-(4-fluorophenyl)-6-phenylspiro[10-oxa-22-aza-15-azoniahexacyclo[11.10.0.03,11.04,9.015,23.016,21]tricosa-1(13),2,4(9),5,7,11,15(23),16,18,20-decaene-14,6'-pyrido[2,1-a]isoindol-5-ium]-3'-yl]-trimethylsilane by IUPAC nomenclature, provide its molecular formula.
user
C49H40FN3OSi+2
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