You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-(3,4-dichlorophenyl)-1-[(8R)-4-[(4-fluorophenyl)methyl]-8-pyrrolidin-1-yl-3,4a,5,7,8,8a-hexahydro-2H-pyrano[3,4-b]pyrazin-1-yl]ethanone is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H30Cl2FN3O2
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