COc1cc(/N=C2/C(=O)N3c4c(cccc42)C(C)=CC3(C)C)cc(OC)c1
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?