You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 21,21-dimethyl-5-N,18-N-bis(2-methylphenyl)-5-N,18-N-diphenylpentacyclo[12.7.0.02,7.08,13.015,20]henicosa-1(14),2(7),3,5,8,10,12,15(20),16,18-decaene-5,18-diamine into molecular formula.
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C49H40N2
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