Alternatively, {HEAD ~ an ester} of an organic acid may be used to carry out {TAIL ~ the precipitation}; such as methyl, ethyl, or propyl esters of acetic acid, propionic acid, butyric acid, oxalic acid, malonic acid, succinic acid, or glutaric acid; dimethyl, diethyl, dipropyl esters of oxalic acid, malonic acid, succinic acid, or glutaric acid 
used to carry out
Alternatively , { HEAD ~ an ester } of an organic acid may be used to carry out { TAIL ~ the precipitation } ; such as methyl , ethyl , or propyl esters of acetic acid , propionic acid , butyric acid , oxalic acid , malonic acid , succinic acid , or glutaric acid ; dimethyl , diethyl , dipropyl esters of oxalic acid , malonic acid , succinic acid , or glutaric acid
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH