Under IUPAC nomenclature, a molecule named 8-(hydroxymethyl)-3-methyl-5-propan-2-yl-2-[1,6,7-trihydroxy-8-(hydroxymethyl)-3-methyl-5-propan-2-ylnaphthalen-2-yl]naphthalene-1,6,7-triol is given. What is its corresponding molecular formula?