„INITIAL STUDIES TOWARDS DETERMINING THE ORIGIN OF 13C DEPLETION IN O-METHYL AND N-METHYL GROUPS OF NATURAL PRODUCTS BY 13C NMR SPECTROMETRY” Katarzyna M. Romek, Pierrick Nun, Gérald S Remaud, Virginie Silvestre, Piotr Paneth, Richard J. Robins, ISOTOPES 2015 – Isotope effects across disciplines, 21 – 26 June 2015, Jerusalem, Israel