Much respect John
But this is straight from Franks link.

W-18 was commonly reported to be an opioid in the popular press in the 2010s, which was later revealed not to be correct.[7][8][9]W-18 was found to obtain weak activity at both sigma receptors and the translocator protein (peripheral benzodiazepine receptor).[9] It also inhibits hERG binding, an important antitarget in drug discovery, which possibly causes cardiovascular side-effects.[9]

The two drugs listed above are opioids no doubt.

Yes I agree with a level playing field.