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Chemical structure of lipid layer constituents (a) and phenolic compounds previously identified in G. tinctoria (b). Regarding catechin (1); (3R)-2(S)-(3,4-dihydroxyphenyl)chromane-3,5,7-triol, (2); (3S)-2(R)-(3,4-dihydroxyphenyl)chromane-3,5,7-triol, (3); (3R)-2(R)-(3,4-dihydroxyphenyl)chromane-3,5,7-triol, (4); (3S)-2(S)-(3,4-dihydroxyphenyl)chromane-3,5,7-triol.
