Parameritannin A-3, a new tetrameric A-type proanthocyanidin, along with the cinnamtannin B-2, pavetannin C-1 and cinnamtannin D-1 have been isolated from the bark of Parameria laevigata.Complete assignments by spectroscopic analysis established their structures as epicatechin -(2bAEOAE7, 4bAE6)epicatechin -(2bAEOAE7, 4bAE8) -epicatechin -(4bAE8) -epicatechin, epicatechin-(4bAE8)-epicatechin-(2bAEOAE7, 4bAE8)-epicatechin-(4bAE8)-epicatechin, epicatechin-(4bAE6)-epicatechin-(2bAEOAE7, 4bAE8)-epicatechin-(4bAE8)-epicatechin, epicatechin-(2bAEOAE7, 4bAE8)-epicatechin-(4bAE8)-catechin, respectively.
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Satake et al. (2003) studied this question.
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