4-ho-malt 4-ho-malt 4-ho-malt (4-hydroxy-n-methyl-n-allyltryptamine) is a tryptamine derivative which has been sold as a designer drug, first being detected in slovenia in 2021. 4-ho-maltidentifiers iupac name 3-ethyl]-1h-indol-4-ol pubchem cid156147982chemspider84400432chemical and physical dataformulac14h18n2omolar mass230.311 g·mol−13d model (jsmol)interactive image smiles cn(ccc1=cnc2=c1c(=cc=c2)o)cc=c inchi inchi=1s/c14h18n2o/c1-3-8-16(2)9-7-11-10-15-12-5-4-6-13(17)14(11)12/h3-6,10,15,17h,1,7-9h2,2h3key:nwewnvpcyzonhk-uhfffaoysa-n