Homosekikaic acid

Fig. 28. A Hiascic acid, GE. Bar 100 im. B Homosekikaic acid (from Cladonia ramulosa (With.) Laundon), oT. Bar lOOjLim. C Hypothamnolic acid (from Cladonia pseudostellata Asah.), GE. Bar 100 p.m. D Hypothamnolic acid, GE. Bar 10 pm.

Deriv Methyl homosekikate, crystals, mp 106 °C, from homosekikaic acid with CH2N2 StL Cladonia ramulosa (With.) Laund. 

Atranorin, protolichesterinic acid, usnic acid, 2-hydroxy-4-methoxy-6-propyl benzoic acid, homosekikaic acid, sekikaic acid, benzoic acid, 2,4-dihydroxy-6-propyl and 2,4-dihydroxy-3,6-dimethyl benzoate isolated from the hexane extract from Ramalina roesleri were assayed for antioxidant activity by l,l-diphenyl-2-picrylhydrazyl (Sisodia et al. 2013). Maximum DPPH radical scavenging activity was exhibited by sekikaic acid followed by homosekikaic acid. 

---