these results support the suggestion ( campbell , i. m. ( 1969 ) tetrahedron lett . 4777-4780 ) that the three-carbon unit of lawsone and , hence by inference , the four-carbon side chain of o-succinylbenzoic acid , is derived from the thiamin pyrophosphate adduct of succinic semialdehyde ( likely in the anion form ) .
C0021966
i
C0003075
anion