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Translate the chemical IUPAC name 2-[[16-[(1,3-dioxocyclopenta[b]naphthalen-2-ylidene)methyl]-5,5,11,11,17,17-hexamethyl-6-pentacyclo[10.7.0.02,10.04,8.014,18]nonadeca-1(12),2(10),3,6,8,13,15,18-octaenyl]methylidene]cyclopenta[b]naphthalene-1,3-dione into its molecular formula.
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C53H38O4
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