4-HO-DPT is a novel synthetic tryptamine and is the dipropyl structural homologue of psilocin.
4-HO-DPT (as well as its phosphate ester, 4-PO-DPT) have been isolated from Psilocybe cubensis grown on mycelium substrate supplemented with N,N-DPT (N,N-dipropyltryptamine). 
It is NOT intended for human consumption, and is strictly for laboratory reagent or forensic analysis purposes ONLY. It is available only as the fumarate salt.
 - http://www.cognitiveliberty.org/shulgin/blg/2005/12/4-hydroxy-5-methoxy-nn_07.html