The Seventh Circuit has determined that the Illinois definition of cocaine, which includes optical, positional, and geometric isomers, is overbroad as compared to the definition of cocaine in the Controlled Substance Act, which includes only optical and geometric isomers.
The full text of US v. Ruth can be found here:
https://cases.justia.com/federal/appellate-courts/ca7/20-1034/20-1034-2020-07-20.pdf?ts=1595264438