CC(=O)c1c2c(cc3c1CC1(C3)Cc3cc4c(c(C(C)=O)c3C1)CCC4)CCC2
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?