CCCCCc1cc(=O)oc2c(C(CCN3CCCC(C)C3)c3ccc(N(C)C)cc3)c(OC)cc(OC)c12
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?