Hi, I have an abstract, maybe it can help you, but unfortunately I do not have the full paper:
A. DURRANI, G. SUN, J. TYMAN: Long chain phenols: XX. Synthesis of oxidative degradation products from the methylated component. Phenols of anacardium occidentale and other phenolic lipids: confirmation of the structure of the parent phenols and of a related material. Lipids 17, 561-569 (1982). Isolation of the degradation products of anacardic acid, cardol, 2-methyl-cardol and cardanol by TLC on silica with a) chloroform, b) chloroform ethyl acetate 95:5, c) chloroform - petrol ether 6:4. Detection and visualization acc. to J. Caplin and J. Tyman, J. Chem. Res. 5, 34-35, 11, 0321- 0351 (1982).