CAS: 79-31-2 Molecular Formula: C4H8O2 Molecular Weight (g/mol): 88.11 MDL Number: MFCD00002658 InChI Key: KQNPFQTWMSNSAP-UHFFFAOYSA-N Synonym: isobutyric acid,isobutanoic acid,2-methylpropionic acid,propanoic acid, 2-methyl,dimethylacetic acid,isopropylformic acid,iso-butyric acid,isobutyrate,cenex rp b2,acetic acid, dimethyl PubChem CID: 6590 ChEBI: CHEBI:16135 IUPAC Name: 2-methylpropanoic acid SMILES: CC(C)C(O)=O