M 2525 (OTTO) 3-Methoxybenzaldehyde, 97% Cas 591-31-1 - used to prepare 3-(3-methoxy-phenyl)-1-phenyl-propenone by reaction with benzldehyde. It is used as an eluent for mono-13C isotopomers of vanillin in normal phase silica gel chromatography. It acts as an inhibitor of 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone (NNK) metabolism.