"unsaturated alkane" is an oxymoron. Unsaturated compounds have bonds of double order or higher; alkanes, by definition, have only single bonds between carbon atoms. Hydrocarbon chains with a C=C bond are alkenes, and those with a triple bond are alkynes (not that you'll encounter those often). So, DALT is an N,N-dialkenyltryptamine. I've always been really interested in both DiPT and MET, but for a long time, I was just deeply wrapped up in the phenethylamine hemisphere. I look forward to voyaging forth to really explore the New World.