Furanone
Bro - your referring to furanone di hydro - this seem to be the main ingredient in Verve and a few other "G" type products. If 99% - it will work for you but I wont give any dose recommendations on this because we are all different.
If it has a yellowish tint, it probably isnt 99%, maybe 98 or 97% which is a huge difference.
Given the choice, i would rather try good old GHB that has been synthesized by someone who knows their shit. Dont know of anyone now that does this as i have taken a break from all that. be careful!!!!
peace - M. Kerr