Portosin

Portosins are vinylpyranoanthocyanins, a type of blueish phenolic pigments, found in aged port wine.

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General structure of portosins, with R1 being O-CH3 , R2 being O-CH3, OH or H, R3 being glucose , coumaroylglucose or acetylglucose and R4 being catechin , phenol or a procyanidin dimer .