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. 1999 Feb;181(3):757–763. doi: 10.1128/jb.181.3.757-763.1999

FIG. 4.

FIG. 4

Structures of the ring cleavage products identified by NMR and FAB-MS analyses. In a solution at pH 2.5, compounds III and IV were revealed. When the pH of the solution was raised to pH 7.5, compounds II and III were revealed, with compound II being the major species. Compound II, (E)-4-(2-carboxylatophenyl)-2-oxo-3-butenoate (common name, trans-2′-carboxybenzalpyruvate); compound III, 2-oxo-3-(3-oxo-1,3-dihydro-1-isobenzofuranyl)propanoate; compound IV, 2,2-dihydroxy-3-(3-oxo-1,3-dihydro-1-isobenzofuranyl)propanoate.