obsolete 2-hydroxy-6-oxo-7-methylocta-2,4-dienoate hydrolase activity (obsolete GO:0018767)
OBSOLETE. Catalysis of the reaction: 2-hydroxy-6-oxo-7-methylocta-2,4-dienoate + H2O = cis-2-hydroxypenta-2,4-dienoate + isobutyrate.