CCCN1C(=O)C2(c3ccccc31)c1c(oc3cc(C)c(C)cc3c1=O)C(=O)N2CCCOC
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?