Methanesulfonic acid 3-{4-[6-amino-5-(4-fluoro-3-methyl-benzoyl)-2-oxo-2H-pyridin-1-yl]-3,5-difluorophenoxy}propyl ester → Cyclopentyl(S)-2-(3-{4-[6-Amino-5-(4-fluoro-3-methylbenzoyl)-2-oxo-2H-pyridin-1-yl]-3,5-difluorophenoxy}propylamino)-3-phenylpropionate

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From Intermediate 4D and L-phenylalanine cyclopentyl ester tosylate salt (Intermediate 16), LCMS purity 97%, m/z 648 [M+H]+, 1H NMR (400 MHz, CD3OD), δ: 1.20-1.90 (9H, m), 2.25 (2H, m), 2.35 (3H, s), 3.15 (1H, m), 3.45 (1H, m), 4.25 (2H, m), 4.40 (1H, d), 5.20 (2H, m), 5.82 (1H, d), 6.95 (2H, m), 7.20 (1H, m), 7.30-7.50 (7H, m), 7.75 (1H, d).

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