Various folded molecular structures contain different amount of information. The relative amount of information may be related to relative entropy or entropy change. The conformational entropy change for n-butane has been computed as the function of rotation around the central C-C bond. It appears that the g(+) or g(-) conformers contain about 16% more information than the anti-structure. Furthermore, the syn conformation with the two groups eclipsed contained about 42% more information than the fully staggered anti orientation. The conformational entropy function calculated from 3N-7 internal degrees of freedom was found to be a continuous function.