There is. Cocaine and most other hard stimulants cause lots of dopamine to be released in the brain. Generally when you have higher concentrations of a neurotransmitter than normal for a long time, your brain compensates for the overstimulation by reducing the number of receptors. It doesn't work in exactly the same way as this drug but the end result is the same - reduced number of dopamine neurons, which causes parkinson's symptoms.

The scary thing about this drug is that it doesn't really have anything to do with the fact that they were trying to make opiates, it just happens that if you mess up the reaction you get this really toxic byproduct. As governments keep banning new drugs, chemists (amateur and professional, but it's hard to know which is which since this is all unregulated) keep coming up with new not technically illegal ways to achieve the same effects, and it's really just a matter of time before you create something else toxic. And it's entirely possible that some designer drugs that seem safe at first can end up having bad complications later on, since they're not very well researched and understood. At least we know how toxic meth is - with research drugs, especially newly discovered ones, no one really knows what kind of damage they're doing to themselves.