4.1.2.52	4-hydroxy-2-oxo-heptanedioate	
4.1.2.52	4-hydroxy-2-oxoheptane-1,7-dioate	
4.1.2.52	4-hydroxy-2-oxoheptanedioate	
4.1.2.52	pyruvate + succinic semialdehyde