1-Pyrrolidinecarboxylic acid,3-[(R)-[(4S)-2,2-dimethyl-1,3-dioxolan-4-yl]hydroxymethyl]-5-[(S)-[(4R)-2,2-dimethyl-1,3-dioxolan-4-yl]hydroxymethyl]-2-oxo-, 1,1-dimethylethylester, (3S,5R)-
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