You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named ethane;2-(2-ethylpentyl)-4,5-dimethyl-7-methylidene-1-[(3Z,5Z)-2-methylidenehepta-3,5-dienyl]-2,3,4,6-tetrahydrobenzimidazol-5-ol by IUPAC nomenclature, provide its molecular formula.
user
C27H46N2O
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