5-O-benzoyl-1,1'-ON-isopropylidene-3,4-O-isopropylidenequinamide

7-hydroxy-2,2,2',2'-tetramethyl-tetrahydro-spiro[benz[1,3]dioxol-5,5'-oxazolidin]-4-one

苯甲酰氯

右旋奎宁酸