You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named methyl (2S,3S,4S,5S)-3-(2-methoxyphenyl)-4-nitro-2-phenyl-5-[(E)-2-phenylethenyl]oxolane-2-carboxylate by IUPAC nomenclature, provide its molecular formula.
user
C27H25NO6
assistant