(3aR,6aR)-Pyrrolo[3,4-b]pyrrole-5(1H)-carboxylic acid hexahydro ethyl ester;(3aR,6aR)-5-Ethoxycarbonyl-1H-hexahydropyrrolo[3,4-b]pyrrole;ethyl (3aR,6aR)-2,3,3a,4,6,6a-hexahydro-1H-pyrrolo[3,4-b]pyrrole-5-carboxylate
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