Cc1cc(-c2ccccc2)c2c3c(c(-c4ccccc4)n2n1)c(=O)n(C)c(=O)n3C
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?