methylvanillylecgonine methylvanillylecgonine methylvanillylecgonine or vanillylmethylecgonine is a cocaine analog and metabolite of cocaine found in human urine (possibly with co-ingestion of vanillin-vanilla containing products, as a result of cleavage and binding in vivo but more probably the result of the same metabolic pathways by which vanillylmandelic acid is formed). methylvanillylecgonine names iupac name methyl 3β-tropane-2β-carboxylate systematic iupac name methyl (1r,2r,3s,5s)-3--8-methyl-8-azabicyclooctane-2-carboxylate other names hydroxymethoxycocaine4′-hydroxy-3′-methoxycocaineparahydroxymetamethoxycocaine identifiers cas number 89315-13-9 y 3d model (jsmol) interactive image inchi inchi=1s/c18h23no6/c1-19-11-5-6-12(19)16(18(22)24-3)15(9-11)25-17(21)10-4-7-13(20)14(8-10)23-2/h4,7-8,11-12,15-16,20h,5-6,9h2,1-3h3key: bhhxesnmooysoj-uhfffaoysa-n smiles coc(c1)c(o)ccc1c(=o)oc2cc(cc3)n(c)c3c2c(=o)oc properties chemical formula c18h23no6 molar mass 349.383 g·mol−1 except where otherwise noted, data are given for materials in their standard state (at 25 °c , 100 kpa). infobox references