C-OH 



C-SH 



H,0 



C-CH, 



c-coo 



c-nh: 



CiCHtCH,CH,-C- 



-CK,CH-,- 



H^CH^- 



FiG. 6-7. Scale drawings of the van der Waals' contours of some important groups 

 and molecules to indicate as clearly as possible in two dimensions the configurations 

 that must be considered in interactions. The dashed circles represent the covalent 



radii of the atoms. 



