February 2014 issue
Cover illustration: The compound C11H13NO6 exhibits an intramolecular O-HO=C hydrogen bond between the N-hydroxyl H atom and carbonyl O atom of the neighboring acetyl group. This finding contradicts a previously published model in which the hydrogen bond was postulated to occur with the neighboring carbomethoxy group. This relatively strong hydrogen bond [O-HO: D = 2.5583 (11) Å and = 152°] may underlie the resistance of the title compound to oxidation into the corresponding nitroxide. See: Rosen, Muralidharan, Zavalij & Kao [Acta Cryst. (2014). E70, o110-o111].