View all references and its conversion into hydroxybutenolides, γ??oxo acids, γ??oxo esters, and 5??aminolevulinic acid hydrochlororide.33. Cottier , L. , Descotes , G. , Eymard , L. and Rapp , K. 1995. Syntheses of γ??oxo acids or γ??oxo esters by photooxygenation of furanic compounds and reduction under ultrasound: application to the synthesis of 5??amniolevulinic acid hydrochloride. Synthesis, : 303–306. ... View all references More recently, we applied our ...