[CH3:1][O:2][C:3](=[O:18])[C@@H:4]([NH:10]C(OC(C)(C)C)=O)[CH2:5][S:6][CH2:7][CH:8]=[CH2:9].[ClH:19]>O1CCOCC1>[ClH:19].[CH3:1][O:2][C:3](=[O:18])[C@@H:4]([NH2:10])[CH2:5][S:6][CH2:7][CH:8]=[CH2:9]Methyl ester 29 (3.20 g, 11.6 mmol) was dissolved in 4M hydrogen chloride in 1,4-dioxane (40 mL). The resultant solution was stirred at rt for 18 h before being concentrated in vacuo to yield a white solid, 2.46 g, 100%.
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