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Carlos Fernández-Moriano et al.
a)
Alectoronic acid
O
O
O
OH
HO O O
O
HO
b)
Protocetraric acid
O OH
O OH
HO O O
O HO
c)
Usnic acid
O
OH O
HO OH
O
O
Figure 1. Chromatograms adquired at 254 nm for the metanol extracts of Cetrelia braunsiana (a),
Parmotrema saccatilobum (b) and Usnea ghattensis (c).
174 @Real Academia Nacional de Farmacia. Spain
