CC1(C)CCc2cc3c(cc2O1)OC(C)(C)C1c2c(ccc4c2CCC(C)(C)O4)OC31
A rotatable bond is defined as any single non-ring bond, attached to a non-terminal, non-hydrogen atom. Amide C-N bonds are not counted because of their high barrier to rotation.  How many rotatable bonds does the molecule have?