Fig. 12From: Specific energy contributions from competing hydrogen-bonded structures in six polymorphs of phenobarbitalCrystal packing of polymorph V. Interactions of selected A and B molecules (drawn in ball-and-sticks-style) within the same C-3 chain (blue) and with molecules belonging to four neighbouring chains (@1–@4; see Fig. 11). Together, C-3 hydrogen bonding and the @1 and @2 chain stacking interactions account for 84 % of E T,Cry Back to article page