4-ho-mcpet 4-ho-mcpet 4-ho-mcpet (4-hydroxy-n-methyl-n-cyclopentyltryptamine) is a tryptamine derivative which has serotonergic effects. 4-ho-mcpetidentifiers iupac name 3-ethyl]-1h-indol-4-ol cas number77872-48-1 ypubchem cid21786595chemspider10513085 yunii3r9fyl6txxchemical and physical dataformulac16h22n2omolar mass258.359 g·mol−13d model (jsmol)interactive image smiles cn(ccc1=cnc2=c1c(=cc=c2)o)c3cccc3 inchi inchi=1s/c16h22n2o/c1-18(13-5-2-3-6-13)10-9-12-11-17-14-7-4-8-15(19)16(12)14/h4,7-8,11,13,17,19h,2-3,5-6,9-10h2,1h3key:qtxsmwngmgywta-uhfffaoysa-n