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. 2019 Mar 22;18:93. doi: 10.1186/s12936-019-2724-z

Fig. 13.

Fig. 13

Key stages in the hit to lead pathway of AN13762. Initial replacement of the carboxylic acid chain with a pyrazine, and subsequent switch of the ester to a substituted amide helped to improve in vivo stability and bioavailability leading to the optimized compound