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system
Name the molecular formula for the molecule established as 6-methyl-7-prop-1-ynyl-10,20-diselenapentacyclo[11.7.0.03,11.04,9.014,19]icosa-1,3(11),4(9),5,7,12,14,16,18-nonaene using the IUPAC nomenclature.
user
C22H14Se2
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