guaiacolsulfonate guaiacolsulfonate guaiacolsulfonate (also called sulfoguaiacolum) is an aromatic sulfonic acid used in medicine as an expectorant. guaiacolsulfonateclinical datamedlineplusa606008pregnancycategory iv, v, vi, vii, viii --> atc coder05ca09 (who) identifiers iupac name 4-hydroxy-3-methoxy-benzenesulfonic acid cas number50855-43-1 ypubchem cid4874chemspider4708 yunii713aj00npgcomptox dashboard (epa)dtxsid80991669 echa infocard100.027.668 chemical and physical dataformulac7h8o5smolar mass204.20 g·mol−13d model (jsmol)interactive image smiles coc1cc(s(=o)(=o)o)ccc1o inchi inchi=1s/c7h8o5s/c1-12-7-4-5(13(9,10)11)2-3-6(7)8/h2-4,8h,1h3,(h,9,10,11) ykey:pswovmuiockejx-uhfffaoysa-m y (verify)