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Under IUPAC nomenclature, a molecule named (4S,7S)-4-[[(2S)-2-[[(2R)-2-[[(2S)-2-[(3R,6S,11Z)-6-(2-carboxyethyl)-2,5,8-trioxo-3-[[(2S)-1-oxopropan-2-yl]amino]-1,4,7-triazacyclotridec-11-en-1-yl]-2-[[(2S)-1-oxopropan-2-yl]amino]acetyl]amino]-2-[[(2S)-1-oxopropan-2-yl]amino]acetyl]amino]-2-[[(2S)-1-oxopropan-2-yl]amino]acetyl]amino]-8-methoxy-5,8-dioxo-7-[[(2S)-1-oxopropan-2-yl]amino]octanoic acid is given. What is its corresponding molecular formula?
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C43H65N11O18
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