In the folders are usually subfolders. "n" stand for neutral molecules,
 "p" stands for plus which means the molecules have charge of +1,
 "pp" stands for plusplus which means the molecules have charge of +2,
 and "m" stands for minus which means the molecules have charge of -1.

The roation folder has only the molecules with a charge of +1. 
It contains the structures calcaulted with COSMO and in that folder with DCOSMO-RS. 
The number infront stands for the degree of rotation.
