4-ho-mcpt 4-ho-mcpt 4-ho-mcpt (4-hydroxy-n-methyl-n-cyclopropyltryptamine) is a psychedelic tryptamine derivative. it has serotonergic effects, and has reportedly been sold as a designer drug since around 2016, but was not definitively identified by forensic laboratories until 2018. it is illegal in finland. 4-ho-mcptidentifiers iupac name 3--1h-indol-4-ol pubchem cid155253443chemical and physical dataformulac14h18n2omolar mass230.306 g·mol−13d model (jsmol)interactive image smiles oc3cccc2ncc(ccn(c)c1cc1)c23 inchi inchi=1s/c14h26n2o/c1-16(11-5-6-11)8-7-10-9-15-12-3-2-4-13(17)14(10)12/h10-15,17h,2-9h2,1h3key:cvvnqyzaswdfib-uhfffaoysa-n