COCCn1c(SCC(=O)c2[nH]c(C)c(C(C)=O)c2C)nc2ccccc2c1=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?