CAS No 16568-56-2 , 3-[2-[[3-(2-carboxyethyl)-5-[(Z)-(3-ethyl-4-methyl-5-oxopyrrol-2-
ylidene)methyl]-4-methyl-1H-pyrrol-2-yl]methyl]-5-[(Z)-(4-ethyl-3-
methyl-5-oxopyrrol-2-ylidene)methyl]-4-methyl-1H-pyrrol-3-yl]propanoic
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