CC1OC(Oc2ccc3ccc(=O)oc3c2-c2c(O)ccc3cc(Oc4ccc5ccc(=O)oc5c4)c(=O)oc23)C(O)C(O)C1O
A rotatable bond is defined as any single non-ring bond, attached to a non-terminal, non-hydrogen atom. How many bonds in the molecule are rotatable?