CC(C)(C)n1c(=O)n2n(c1=O)C1c3cccc4cccc(c34)C2C2c3cccc4cccc(c34)C1n1c(=O)n(C(C)(C)C)c(=O)n12
A rotatable bond is defined as any single non-ring bond, attached to a non-terminal, non-hydrogen atom. How many bonds in the molecule are rotatable?