You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 4,6-diethyl-1,3a,4,5,6,6a-hexahydrocyclopenta[c]furan-3-one;1,3-diethyl-1,2,3,3a,4,5,6,6a-octahydropentalene;4,6-diethyl-3a,4,6,6a-tetrahydro-1H-furo[3,4-c]furan-3-one;7,9-diethyl-2-oxaspiro[4.4]nonan-1-one;3,5-diethyltricyclo[5.2.1.02,6]decane;(1-ethylcyclopentyl) 3,5-diethyltricyclo[5.2.1.02,6]decane-8-carboxylate;(1-methylcyclopentyl) 3,5-diethyltricyclo[5.2.1.02,6]decane-8-carboxylate .
user
C156H260O19
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