BiomarkerOf malic acid A 2-hydroxydicarboxylic acid that is succinic acid in which one of the hydrogens attached to a carbon is replaced by a hydroxy group. CHEBI:6650 20130941 | 525 C00711 | C03668 | D04843 FOBI:030632 HMDB00744 BJEPYKJPYRNKOW-UHFFFAOYSA-N InChI=1S/C4H6O5/c5-2(4(8)9)1-3(6)7/h2,5H,1H2,(H,6,7)(H,8,9) 14080972 | 510 Beta hydroxy acids and derivatives apple (whole)