GHB in Aqua Dots

So there it is...they are ominously out to poison everybody, especially through a sinister delayed action transformation of a precursor into a deadly chemical. I could not be more thankful that I did not play with Aqua Dots as a kid...

In any case, does anyone know what it was in the dots that transformed into GHB (Dr. Sanjay Gupta probably does not)? Wikipedia lists two possible prodrugs, the lactone which is ring opened and 1,4 butanediol which is oxidised to GHB by alcohol dehydrogenase. Or maybe it's just proprietary ("Better killing through proprietary means")