You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 1-[4-(10,18-dimethoxy-5-phenylspiro[6-oxapentacyclo[12.7.0.02,7.08,13.015,20]henicosa-1(14),2(7),3,8(13),9,11,15(20),16,18-nonaene-21,15'-tetracyclo[10.2.1.05,14.08,13]pentadeca-1,3,5(14),6,8(13),9,11-heptaene]-5-yl)phenyl]piperidine by IUPAC nomenclature, provide its molecular formula.
user
C53H41NO3
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