You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (2R,3R,3aS,6aS)-5-[5-(butylamino)pentyl]-3-[(3S)-3-hydroxy-4-(3-methylphenyl)but-1-enyl]-1,2,3,3a,4,6a-hexahydropentalen-2-ol by IUPAC nomenclature, provide its molecular formula.
user
C28H43NO2
assistant