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system
Provide the molecular formula for the IUPAC named substance N-[(3aR,6aR)-3-(5-chloro-2-methoxyphenyl)-5,5-dioxo-3a,4,6,6a-tetrahydrothieno[3,4-d][1,3]thiazol-2-ylidene]-3-cyclopentylpropanamide .
user
C20H25ClN2O4S2
assistant