You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (2R,3R,11bR)-2-(6-iodo-6-methylheptoxy)-3-(2-methylpropyl)-2,3,4,6,7,11b-hexahydro-1H-benzo[a]quinolizine-9,10-dicarbaldehyde by IUPAC nomenclature, provide its molecular formula.
user
C27H40INO3
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