Accordingly, we considered larger MCSs. One such simple cluster contains two DIPA molecules with four water molecules between them (Figure , middle). In this configuration, a hydrogen bonding network is created through O-N and O-O hydrogen bonds. This GMCS is shown as the beige line in Figure . It displays features in r out to 10 Å, approaching the r-range of the main features at 7.5 and 12 Å, but not to the weak signals seen in the data up to 18 Å. Finally, we consider a more complex MCS with 16 amines and 64 waters (Figure , right). This is the first cluster (grey curve in Figure ) we consider which has intensity in GMCS extending to the 8-20 Å, as seen in ddG. The arrangement of the MCS is such that a network of hydrogen bonded water molecules at the center is able to hydrogen bond to nitrogen atoms on surrounding DIPA molecules, forming a reverse-micelle like structure.