The B-ring typically consists of a bilane or bilatriene structure. Depending on the specific derivative, this may involve the formation of a cyclohexenone or similar core.
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3-[2-[(Z)-[(5E)-3-(2-carboxyethyl)-5-[(4-ethyl-3-methyl-5-oxo-pyrrol-2-yl)methylene]-4-methyl-pyrrol-2-ylidene]methyl]-5-[(Z)-[(3E,4R)-3-ethylidene-4-methyl-5-oxo-pyrrolidin-2-ylidene]methyl]-4-methyl-1H-pyrrol-3-yl]propanoic acid
Toluene-4-sulfonic acid (3'aS,4'R,5'S,7'aR)-5'-hydroxy-7'a-methyl-octahydro-spiro[[1,3]dioxolane-2,2'-inden]-4'-ylmethyl ester
