  Using UV images taken with the Telescopio Nazionale Galileo, we discovered an
anomalous sequence in the color-magnitude diagram of M 2. This feature appears
as a narrow poor-populated red giant branch, which extends down to the sub
giant branch region. We speculate that this new feature could be the extension
of the faint component of the split sub giant branch recently discovered by
Piotto et al. We identified in our UV images two CH stars detected in previous
studies. These stars, which are both cluster members, fall on this redder
sequence, suggesting indeed that the anomalous RGB should have a peculiar
chemical pattern. Unfortunately, no additional spectra were obtained for stars
in this previously unknown substructure
