C=CCn1c2ccccc2c2nnc(SCC(=O)Nc3c(C)n(C)n(-c4ccccc4)c3=O)nc21
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?