1-Piperazinecarboxylic acid,4-[2-[[(1S)-1-carboxyethoxy]hydroxyphosphinyl]ethyl]-,1-[7-[(4-fluorophenyl)methyl]-7,8-dihydro-9-hydroxy-8-oxo-6H-pyrrolo[3,4-g]quinolin-5-yl] ester
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