I recall reading an 'ible, this one:,

https://www.instructables.com/id/Recycling-Styrofo...

which used something similar, maybe the same thing, called D-limonene. I think the author of that 'ible linked to an eBay seller selling this compound.

Although I assume there is more than one seller out there, selling the same, or similar things.

There is also a likely a Wikipedia entry for D-limonene, you know, since this is a somewhat well known, commodity chemical. Um... here:

https://en.wikipedia.org/wiki/Limonene

So, you can read more about this chemical if you want to.