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Name the molecular formula for the molecule established as methyl N-[(15S)-15-amino-18-chloro-9-oxo-8,17,19-triazatricyclo[14.2.1.02,7]nonadeca-1(18),2,6,16(19)-tetraen-5-yl]carbamate using the IUPAC nomenclature.
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C18H24ClN5O3
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