Fig. 10: TIC and chemical structure of alkyl-substituted catechols from residual fragments of the leather artifact.
From: Revealing the secrets of a lacquered leather artifact through molecular fingerprints

a TIC at m/z = 91, b m/z = 107, c m/z = 123, and d the general structure of alkyl-substituted catechols (R represents an alkyl group of varying chain length).