Figure 4.

Carbon stable isotope compositions of aldehydes and ketones (circles, this study), their structurally analogous amines (Aponte et al., 2014), amino acids (Engel et al., 1990; Pizzarello et al., 2004; Elsila et al., 2012), monocarboxylic acids (Yuen et al., 1984; Huang et al., 2005), hydroxy acids (Pizzarello et al., 2010) and aromatics derived from macromolecular insoluble organic material (Sephton et al., 1998; Sephton and Gilmour, 2001) in the Murchison meteorite. Individual (E) and (Z) isomers of derivatized aldehydes and ketones are labeled where applicable. Upper indices assigned to individual amines, carboxylic acids and hydroxy acids in the legend denote the corresponding data points for each compound in the figure.