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system
Provide the molecular formula for the IUPAC named substance methyl (2S)-2-[[(3S,4R,6S,7S,8R,8aR)-5'-(4-hydroxybut-1-ynyl)-6-[4-(2-hydroxyethoxy)phenyl]-8-[[(2R)-2-hydroxy-2-phenylethyl]carbamoyl]-1,2'-dioxo-3,4-diphenylspiro[4,6,8,8a-tetrahydro-3H-pyrrolo[2,1-c][1,4]oxazine-7,3'-indole]-1'-carbonyl]amino]-3-methylbutanoate .
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C54H54N4O11
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