SL-164 is an analogue of methaqualone developed in the late 1960s by a team at Sumitomo. SL-164 has similar sedative, hypnotic and anticonvulsant properties to the parent compound, but was never marketed for clinical use.

Unique report for tgc-rc:
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I took a quantity of 400 mg of SL-164. My stomach was empty (I had not eaten in the past five hours). I have never had experience with Methaqualone. I live in Canada and next to my house there is a forest and a hill. I went there straight after taking the dose. Now, after around 30 minutes (I think) the drug had kicked in. I tried to go back to my house but I was completely confused on the way. I can not say exactly how long it took me to find my way back, but it was at least 20 minutes (which should take no more than 5 minutes). Now I got home and ... WOW! It's probably the best feeling I've ever felt. The heat of the heroin combined with the confusion of good weed and the lack of concern of the alcohol (but without nausea). I also began to imagine delusional and sweet things. As if the whole world is true. All the gods are friends and enjoy the party together and laugh at everything. It's a bit hard to explain - just such a sweet imagination. The best feeling I've ever had. There is no doubt. Unfortunately after about two hours the experience began to religion gradually and after three hours disappeared and got a unpleasant nausea and almost puke. The next day the memory was very blurry about exactly what had happened at night and what I had done in my house. Anyway, the experience was totally worth the nausea of after. 
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Note:
The product shipped from Europe!