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system
Provide the molecular formula for the IUPAC named substance 3-[(2S,5R,8S)-8-(2-carboxyethyl)-3,6,9,12-tetraoxo-5-(sulfanylmethyl)-1,4,7,10-tetrazacyclododec-2-yl]propanoic acid .
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C15H22N4O8S
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