Ledipasvir Impurity 14;

(1R,3S,4S)-2-Azabicyclo[2.2.1]heptane-2,3-dicarboxylic acid 2-tert-butyl ester;

(3S)-N-Boc-2-azabicyclo[2.2.1]heptane-3-carboxylic acid;

(1R,3S,4S)-N-Boc-2-azabicyclo[2.2.1]heptane-3-carboxylic acid;

2-Azabicyclo[2.2.1]heptane-2,3-dicarboxylic acid, 2-(1,1-diMethylethyl) ester, (1R,3S,4S)-;

(1R,3S,4S)-N-(Tert-butoxycarbonyl)-2-azabicyclo-[2.2.1]-heptane-3-carboxylic acid

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