COc1ccc2c(CCNC(=O)/C=C/c3ccccc3)c(C(C)=O)[nH]c2c1[N+](=O)[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?