The term “sulfoxide” refers to {TAIL ~ a group} —SR, in which R is alkyl, {HEAD ~ aryl}, or heteroaryl 
The term “ sulfoxide ” refers to { TAIL ~ a group } — SR , in which R is alkyl , { HEAD ~ aryl } , or heteroaryl
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH