Cc1c(C)c(C)c(-n2c(=O)n(C)c(=O)n2-c2cc(C(C)(C)C)cc(C(C)(C)C)c2O)c(C)c1C
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?