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system
Provide the molecular formula for the IUPAC named substance (5'S,9'R)-16'-ethoxy-5',13'-dimethylspiro[cyclopropane-1,19'-pentacyclo[10.8.0.02,9.05,9.013,18]icosa-1(12),2,6,15,17-pentaene]-8'-one .
user
C26H30O2
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