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(2S,9S,9aR)-9-((7S,7aS)-5,13-Dioxo-5,6,7,7a,8,13-hexahydro-6,8,13a-triaza-benzo[3,4]cyclohepta[1,2-b]naphthalen-7-ylmethyl)-9-hydroxy-2-isobutyl-3-oxo-2,3,9,9a-tetrahydro-imidazo[1,2-a]indole-1-carboxylic acid benzyl ester