2c-yn 2c-yn 2c-yn is an analog of phenethylamine that can be synthesized from 2c-i. very little data exists about the pharmacological properties, metabolism, and toxicity of 2c-yn, although daniel trachsel lists it as having a dosage of around 50mg and a duration of around 2 hours, with relatively mild psychedelic effects. 2c-ynlegal statuslegal status uk: class a identifiers iupac name 2-(4-ethynyl-2,5-dimethoxyphenyl)ethanamine cas number752982-24-4 y 633290-73-0pubchem cid12063400chemspider26234934 yunii5l67256f94comptox dashboard (epa)dtxsid00476741 chemical and physical dataformulac12h15no2molar mass205.257 g·mol−13d model (jsmol)interactive image smiles coc1cc(ccn)c(oc)cc1c#c inchi inchi=1s/c12h15no2/c1-4-9-7-12(15-3)10(5-6-13)8-11(9)14-2/h1,7-8h,5-6,13h2,2-3h3 ykey:mljhhyijbzvuea-uhfffaoysa-n y ny (what is this?) (verify) legality canada as of october 31st, 2016; 2c-yn is a controlled substance (schedule iii) in canada. http://gazette.gc.ca/rp-pr/p2/2016/2016-05-04/html/sor-dors72-eng.php