(2R,3R)-2,3-bis{[(4-methylphenyl)carbonyl]oxy}butanedioic acid - (1-ethylpropyl)[(3aS,8aR)-3a-methyl-1,2,3,3a,8,8a-hexahydroindeno[2,1-b]pyrrol-5-yl]carbamic acid (1:1)
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