Yes, you should be able to do that with water. Elemicin is insoluble in water, and so adding enough water to the DMSO layer should cause the elemicin to float to the top. SWIM hasn’t tried this yet, but I’m sure it would work. Then you could maybe freeze the DMSO/Water, and then pour off the elemicin.

Also, there’s a tip I wanted to mention about this tech. Instead of using a pipette or other similar way of separating the oil from the DMSO layer, you can instead freeze the DMSO in the refrigerator (no need for a freezer, DMSO freezes in the refrigerator) and simply pour off the oil. That makes separation a snap!