You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the compound with this IUPAC name dimethyl (1R,2S,3S,10bS)-8,9-dimethoxy-2-(3,4,5-trimethoxyphenyl)-1,2,3,5,6,10b-hexahydropyrrolo[2,1-a]isoquinoline-1,3-dicarboxylate ?
user
C27H33NO9
assistant