Constituents of a Fern, Davallia mariesii MOORE. II. Identification and 1H- and 13C-NUclear Magnetic Resonance Spectra of Procyanidin B-5, Epicatechin-(4.BETA..RAR.8)-epicatechin-(4.BETA..RAR.6)-epicatechin, and Epicatechin-(4.BETA..RAR.6)-epicatechin-(4.BETA..RAR.8)-epicatechin-(4.BETA..RAR.6)-epicatechin.

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Abstract
Procyanidin B-5 (1), epicatechin-(4β→8)-epicatechin-(4β→6)-epicatechin (2), and epicatechin-(4β→6)-epicatechin-(4β→8)-epicatechin-(4β→6)-epicatechin (3), which showed an inhibitory effect toward protein kinase C, were isolated from the rhizomes of Davallia mariesii MOORE. Detailed analyses of their 1H- and 13C-nuclear magnetic resonance spectra were carried out by the use of two-dimensional nuclear magnetic resonance techniques.