You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-methylpropyl (4aS,8aR)-6-ethyl-8a-(3-hydroxyphenyl)-3-methyl-4,4a,5,7,8,9-hexahydro-1H-pyrrolo[2,3-g]isoquinoline-2-carboxylate;hydrochloride is the IUPAC name of a molecule. Please give its molecular formula.
user
C25H35ClN2O3
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