4.2.99.20	5-enolpyruvoyl-6-hydroxy-2-succinyl-cyclohex-3-ene-1-carboxylate	step in menaquinone biosynthesis	
4.2.99.20	5-enolpyruvoyl-6-hydroxy-2-succinyl-cyclohex-3-ene-1-carboxylate	the enzyme is involved in biosynthesis of vitamin K2 (manoquinone). Under basic conditions, the product can spontaneously lose pyruvate to form (1R,6R)-6-hydroxy-2-succinylcyclohexa-2,4-diene-1-carboxylate