Ethyl 3-aminopent-4-enoate → Ethyl 3-[[4-[[4-(aminoiminomethyl)naphthyl](phenylmethyl)-amino]-1,4-dioxobutyl]amino]-4-pentenoate

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The title compound was prepared in the manner of Example 1 substituting 4-[[4-(aminoiminomethyl)naphthyl]amino]-4-oxobutanoic acid hydrochloride for 4-[[4-(aminoiminomethyl)-3-phenyl]amino]-4-oxobutanoic acid hydrochloride and using ethyl 3-amino-4-pentenoate. The product was purified by reverse phase HPLC using the conditions of Example 1 to afford the title compound. The product was verified by 13C NMR (CD3 OD) δ13.2, 30.5, 31.3, 39.0, 48.5, 60.4, 114.6, 120.3, 123.1, 123.9, 124.8, 126.6, 127.0, 128.0, 128.1, 130.3, 136.8, 137.4, 167.6, 171.0, 172.6, 173.0; Chemical Ionization Mass Spectrometry (MH+)=411

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