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