4-ho-pipt 4-ho-pipt 4-hydroxy-n-propyl-n-isopropyltryptamine (4-ho-pipt, piprocin) is a substituted tryptamine derivative which is claimed to have psychedelic effects. it has been sold as a designer drug, first being identified in 2021 in british columbia, canada. 4-ho-piptidentifiers iupac name 3--1h-indol-4-ol chemical and physical dataformulac16h24n2omolar mass260.381 g·mol−13d model (jsmol)interactive image smiles cc(c)n(ccc)ccc1cc2cccc(o)c21 inchi inchi=1s/c16h24n2o/c1-4-9-18(12(2)3)10-8-13-11-17-14-6-5-7-15(19)16(13)14/h5-7,11-12,17,19h,4,8-10h2,1-3h3key:cutupkozxnfvhk-uhfffaoysa-n