Abstract

Conjugates of glycyrrhetic acid (GLA) with amino acids (L-isoleucine, -leucine, -valine, and -phenylalanine) were synthesized by the acid-chloride method using methyl or tert-butyl esters of the acids. Tests in MDCK cell culture showed that the GLA conjugate with phenylalanine exhibited high antiviral activity against influenza A/H1N1/pdm09 virus (ED50 = 4.4 μg/mL, SI = 161).

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