COc1cccc(-c2[nH]c3c(c2-c2c(-n4cccc4)n(C)c(=O)[nH]c2=O)c(=O)[nH]c(=O)n3C)c1
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?