is conjugate base of ibuprofen(1-) chebi_ontology Reaxys:4784081 -1 205.12340 InChI=1S/C13H18O2/c1-9(2)8-11-4-6-12(7-5-11)10(3)13(14)15/h4-7,9-10H,8H2,1-3H3,(H,14,15)/p-1 HEFNNWSXXWATRW-UHFFFAOYSA-M 2-[4-(2-methylpropyl)phenyl]propanoate 205.273 ibuprofen anion A monocarboxylic acid anion that is the conjugate base of ibuprofen, obtained by deprotonation of the carboxy group; major species at pH 7.3. ibuprofen C13H17O2 CHEBI:132922 C=1C=C(C=CC1C(C(=O)[O-])C)CC(C)C monocarboxylic acid anion ibuprofen