CCOC(=O)c1[nH]c(Cc2[nH]c(C(=O)OCC)c(C)c2CCC(=O)OC)c(CCC(=O)OC)c1C
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?