Take your drugs to a drug checking clinic.
If you aren’t sure if what you have is a 2C drug, it is always a good idea to take it to a drug checking clinic. The drug checking technology cannot always reliably tell the difference between 2C drugs (i.e., whether it is 2C-B or 2C-I), but it will be able to tell you if it is mixed with any other drugs, binder, or filler.