You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (6R,12R,15S,18S,21R)-12,15-dibenzyl-18-[(2S)-butan-2-yl]-1,4,10,13,16,19-hexazatricyclo[19.3.0.06,10]tetracosane-2,5,11,14,17,20-hexone by IUPAC nomenclature, provide its molecular formula.
user
C36H46N6O6
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