When illudin S is heated under reflux with an excess of acidified potassium dichromate(VI), compound M is formed. [Figure 28.1: Reaction scheme showing illudin S (a complex bicyclic molecule with a cyclopropane ring, a ketone, an alkene, and two alcohol groups) being converted to compound M (a complex bicyclic molecule with two ketone groups and two carboxylic acid groups).] What is the molecular formula of compound M?

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