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What is the molecular formula of the compound with this IUPAC name [(Z)-[(1R,4S)-1,7,7-trimethyl-2-bicyclo[2.2.1]heptanylidene]amino] (1R,4S)-4,7,7-trimethyl-3-oxobicyclo[2.2.1]heptane-1-carboxylate ?
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C21H31NO3
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