ls-115509 ls-115509 ls-115509 is an opioid analgesic related to the 4-phenylpiperidine family. it is comparable to drugs such as prodine and pheneridine, but is distinguished by the presence of an ether group and furan ring at the piperidine 4-position, which are not found in other drugs of this class. in animal studies, it has around 2-3x the potency of morphine depending on what assay is used. like prodine, it has two stereocenters and four possible enantiomers, but the activity of these has not been tested separately. ls-115509clinical dataatc codenoneidentifiers iupac name 4-ethoxy-4-(furan-2-yl)-3-methyl-1-(2-phenylethyl)piperidine cas number94876-55-8 ypubchem cid3024404chemspider2290335uniixg2jqx2jdjcomptox dashboard (epa)dtxsid50915236chemical and physical dataformulac20h27no2molar mass313.441 g·mol−13d model (jsmol)interactive image smiles ccoc1(ccn(cc1c)ccc2=cc=cc=c2)c3=cc=co3 inchi inchi=1s/c20h27no2/c1-3-23-20(19-10-7-15-22-19)12-14-21(16-17(20)2)13-11-18-8-5-4-6-9-18/h4-10,15,17h,3,11-14,16h2,1-2h3key:inlmdddtziknni-uhfffaoysa-n