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system
Name the molecular formula for the molecule established as (1S)-14-(2-chloroethyl)-5-methoxy-15-thia-10-azatetracyclo[8.7.0.02,7.012,16]heptadeca-2,4,6,12(16),13-pentaen-4-ol using the IUPAC nomenclature.
user
C18H20ClNO2S
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