You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
methyl (2S)-2-[[(3S,4R,6S,7S,8R,8aR)-5'-[3-(benzotriazol-1-yl)prop-1-ynyl]-6-[3-(2-hydroxyethoxy)phenyl]-1,2'-dioxo-3,4-diphenyl-8-(prop-2-enylcarbamoyl)spiro[4,6,8,8a-tetrahydro-3H-pyrrolo[2,1-c][1,4]oxazine-7,3'-indole]-1'-carbonyl]amino]-3-methylbutanoate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C54H51N7O9
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