e-55888 e-55888 e-55888 is a drug developed by esteve, which acts as a potent and selective full agonist at the 5ht7 serotonin receptor, and is used for investigating the role of 5-ht7 receptors in the perception of pain. when administered by itself, e-55888 is anti-hyperalgesic but not analgesic, but when administered alongside morphine, e-55888 was found to significantly increase the analgesic effects. e-55888identifiers iupac name n,n-dimethyl-3-(1,3,5-trimethyl-1h-pyrazol-4-yl)phenethylamine chemspider34980845chemical and physical dataformulac16h23n3molar mass257.381 g·mol−13d model (jsmol)interactive image smiles cn1nc(c)c(c1c)-c(c2)cccc2ccn(c)c inchi inchi=1s/c16h23n3/c1-12-16(13(2)19(5)17-12)15-8-6-7-14(11-15)9-10-18(3)4/h6-8,11h,9-10h2,1-5h3key:mfuwrmrkxkcspl-uhfffaoysa-n (verify)