You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Name the molecular formula for the molecule established as [(6aR,10aR)-5-ethenyl-7-propyl-6,6a,8,9,10,10a-hexahydro-4H-indolo[4,3-fg]quinolin-9-yl]methanol using the IUPAC nomenclature.
user
C20H26N2O
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