(S)-(-)-6-[(5-bromopentyl)oxy]-3,4-dihydro-2,5,7,8-tetramethyl-2H-1-benzopyran-2-carboxylic acid methyl ester 、
2,4-二羟基-3-丙基苯乙酮 以91%的产率得到(S)-(-)-6-[5-(4-acetyl-3-hydroxy-2-propylphenoxy)-pentyloxy]-3,4-dihydro-2,5,7,8-tetramethyl-2H-1-benzopyran-2-carboxylic acid methyl ester