4-ho-pyr-t 4-ho-pyr-t 4-ho-pyr-t (4-hydroxy-n,n-tetramethylenetryptamine) is a lesser-known psychedelic drug. it is the 4-hydroxyl analog of pyr-t. 4-ho-pyr-t was first synthesized by alexander shulgin. in his book tihkal (tryptamines i have known and loved), neither the dosage nor the duration are reported. 4-ho-pyr-t produces few to no effects. very little data exists about the pharmacological properties, metabolism, and toxicity of 4-ho-pyr-t. 4-ho-pyr-t names preferred iupac name 3--1h-indol-4-ol other names 4-hydroxy-n,n-tetramethylenetryptamine identifiers cas number 63097-26-7 n 3d model (jsmol) interactive image chembl chembl364061 y chemspider 10579820 y pubchem cid 21854226 unii 55l8syc7eq y inchi inchi=1s/c14h18n2o/c17-13-5-3-4-12-14(13)11(10-15-12)6-9-16-7-1-2-8-16/h3-5,10,15,17h,1-2,6-9h2 ykey: xaslpzwipbcapf-uhfffaoysa-n y smiles oc2cccc3cc(ccn1cccc1)c23 properties chemical formula c14h18n2o molar mass 230.311 g·mol−1 except where otherwise noted, data are given for materials in their standard state (at 25 °c , 100 kpa). n verify (what is yn ?) infobox references