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Please write the molecular formula of the molecule 9,9,17-trimethyl-6-[10-(6-phenyl-7,8-dihydronaphthalen-2-yl)anthracen-9-yl]-16-[(Z)-prop-1-enyl]-18-oxapentacyclo[11.7.0.02,10.03,8.015,19]icosa-1(20),2(10),3(8),4,6,11,13,15(19),16-nonaene .
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C55H42O
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