That is more like ketamine rather than an opiate like the OP asked for.
There is a chemical called O-Desmethyltramadol, as the name suggests it is related to tramadol. I don't know the chemical link but it is an opiate.
Be careful abusing tramadol or anything linked to it, for a starters Tramadol is known to cause seizures when used long term. Of course it is an opiate so it is addictive and could lead you into serious trouble.
Be safe and sensible with what ever you have planned. What ever you do get come back here and tell us and we can help you be safe. Do loads of reading on whatever you get too.
We're not here to tell you (or your friend) how to get high, sorry.. come back if you have questions about a specific RC (and read the forum guidelines )