(4,6-DIMETHYL-2,5-DIOXO-HEXAHYDRO-IMIDAZO-[4,5-D]IMIDAZOL-1-YL)-ACETIC ACID;(4,6-Dimethyl-2,5-dioxo-hexahydro-imidazo-[4,5-d]imidazol)-acetic acid
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