COC1=CC(=O)c2c(O)c3c(c(O)c2C1=O)OC1(Oc2c(cc4cc(C)oc(=O)c4c2O)CC1O)C3O
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?