CC1CC[C@@]23CCC4(C)[C@@]5(C)CCC6C(C)(C)C(=O)CC[C@@]6(C)C5C=C[C@@]4(OC2=O)C3C1C
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?