CCCC#Cc1ccc2c(c1)O[C@H](CN(C)C(=O)CC1CC1)[C@H](C)CN([C@@H](C)CO)S2(=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?