Rum also works. It has lots of acetaldehyde. Peppermint oil also has lots of acetaldehyde.

SWIM has done it with just peppermint oil and water and it also works. The ethanol apparently isn't actually needed. Something present in the seeds seems to do what the ethanol is supposed to do. Again, no hard evidence, but the effects are almost completely different. Very LSD-like and not at all sedating. But it’s more alien than LSD, so beware.