Catalysis of the reaction: (1E,2Z)-3-hydroxy-5,9,17-trioxo-4,5:9,10-disecoandrosta-1(10),2-dien-4-oate + H2O = 9,17-dioxo-1,2,3,4,10,19-hexanorandrostan-5-oate + (2Z,4Z)-2-hydroxyhexa-2,4-dienoate + H+.
4,5-9,10-diseco-3-hydroxy-5,9,17-trioxoandrosta-1(10),2-diene-4-oate hydrolase activity