These are as primarily chlorofluorocarbons, such as R12 and {HEAD ~ R22}, i.e., {TAIL ~ dichlorodifluoromethane} and chlorodifluoromethane, respectively 
These are as primarily chlorofluorocarbons , such as R12 and { HEAD ~ R22 } , i.e. , { TAIL ~ dichlorodifluoromethane } and chlorodifluoromethane , respectively
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH