CCCCc1nn2c(=O)cc(COC(=O)c3ccc(NC(=O)C4CCCCC4)cc3)nc2s1
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?