CCCCN1C=CN2c3nc4cc(C)c(C)cc4n3C(C(=O)OC)=C(C(=O)OC)C12
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?