Cc1cc(C(=O)CN2C(=O)NC(C)(CC(C)C)C2=O)c(C)n1-c1ccc2c(c1)OCO2
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?