CCOC(=O)C1=c2[nH]c3cccc4cccc(c43)n2C=C(C(C)=O)C1CC(C)=O
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?