The space-group distribution of molecular organic structures

A structural study of seven N-acylindolines and their Pd(II)-mediated intramolecular oxidative coupling reactions for the synthesis of pyrrolophenanthridone alkaloids

“…The space group Pnma is among those providing maximum density packing of C S -symmetric moleculeswhere the molecule retains inherent symmetry[40].Figure 7bshows a limitingly closepacked layer, i.e. a close-packed layer in which the molecule occupies a special position[41], parallel to the (010) plane in the crystal structure of 2c. These layers stack in the b axis direction in an AB sequence, where A and B are rotated to one another by 180°.…”