(S)-2-amino-3-(4-tert-butoxyphenyl)-N-((S)-1,1-diethoxypropan-2-yl)-N-(quinolin-8-ylmethyl)propanamide → 2-allyl-2-(2-((S)-3-(4-tert-butoxyphenyl)-1-(((S)-1,1-diethoxypropan-2-yl)(quinolin-8-ylmethyl)amino)-1-oxopropan-2-ylamino)-2-oxoethyl)-N-((S)-1-phenylethyl)hydrazinecarboxamide

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According to the procedure described in the synthesis method of Compound II-1, (S)-2-(1-allyl-2-(1-phenylethylcarbamoyl)hydrazinyl)acetic acid (Compound VI-5) 133 mg (0.48 mmol) was coupled with (S)-2-amino-3-(4-tert-butoxyphenyl)-N—((S)-1,1-diethoxy-propan-2-yl)-N-(quinolin-8-ylmethyl)propanamide (Compound IV-3) 203 mg (0.4 mmol) and purified on silica gel column chromatography (chloroform:methanol=100:0 to 95:5) to obtain the title compound 250 mg (81%).

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