CC(C)(C)C(=O)OCCn1c(=O)c2cc3c(=O)n(CCOC(=O)C(C)(C)C)c(=O)c3cc2c1=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?