wb-4101 wb-4101 wb-4101 is a compound which acts as an antagonist at the α1b-adrenergic receptor. it was one of the first selective antagonists developed for this receptor and was invented in 1969, but is still commonly used in research into adrenergic receptors, especially as a lead compound from which to develop more selective drugs. wb-4101identifiers iupac name 2-(2,6-dimethoxyphenoxyethyl)aminomethyl-1,4-benzodioxane cas number613-67-2 ypubchem cid5685iuphar/bps499chemspider5483uniie9h51oit2bcomptox dashboard (epa)dtxsid1043885 chemical and physical dataformulac19h23no5molar mass345.389 g·mol−13d model (jsmol)interactive image smiles coc1cccc(c1occncc2coc3ccccc3o2)oc inchi inchi=1s/c19h23no5/c1-21-17-8-5-9-18(22-2)19(17)23-11-10-20-12-14-13-24-15-6-3-4-7-16(15)25-14/h3-9,14,20h,10-13h2,1-2h3key:gyszujhyxczaki-uhfffaoysa-n