COCCn1c(=O)[nH]c2cc(C(=O)Nc3cccc(C(C)=O)c3)ccc2c1=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?