You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 3-N,20-N-bis(3-methylphenyl)-3-N,20-N-diphenylspiro[hexacyclo[20.2.1.05,24.06,11.012,17.018,23]pentacosa-1,3,5(24),6,8,10,12,14,16,18(23),19,21-dodecaene-25,9'-thioxanthene]-3,20-diamine by IUPAC nomenclature, provide its molecular formula.
user
C63H44N2S
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