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system
Name the molecular formula for the molecule established as 15-tert-butylspiro[10,20-diazapentacyclo[11.7.1.02,11.04,9.017,21]henicosa-1(20),2,4,6,8,10,13(21),14,16,18-decaene-12,1'-cyclopentane] using the IUPAC nomenclature.
user
C27H26N2
assistant