Hydrochloric Acid → 3-{4-[1-(2-Formyl-4'-isopropyl-biphenyl-4-yloxy)-3-methyl-butyl]-benzoylamino}-propionic acid

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3-{4-[1-(2-[1,3]Dioxan-2-yl-4′-isopropyl-biphenyl-4-yloxy)-3-methyl-butyl]-benzoylamino}-propionic acid methyl ester (570 mg) is taken into THF (10 ml), treated with 5N HCl for 5 h, neutralfied with 5N NaOH, extracted with ethyl acetate, dried over MgSO4 and concentrated. The residue is purified by column chromatography to afford 3-{4-[1-(2-formyl-4′-isopropyl-biphenyl-4-yloxy)-3-methyl-butyl]-benzoylamino}-propionic acid methyl ester (36 mg) and 3-{4-[1-(2-formyl-4′-isopropyl-biphenyl-4-yloxy)-3-methyl-butyl]-benzoylamino}-propionic acid (228 mg). MS (ES): 502.2 [M+H]+.

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