{HEAD ~ a compound} having {TAIL ~ an active hydrogen} and an acid group, said compound being selected from the group consisting of salicylic acid, thiosalicylic acid, p hydroxybenzoic acid, 3,5 dihydroxybenzoic acid, p aminobenzoic acid, anthranilic acid, and p hydroxyphenylacetic acid, 
having
{ HEAD ~ a compound } having { TAIL ~ an active hydrogen } and an acid group , said compound being selected from the group consisting of salicylic acid , thiosalicylic acid , p hydroxybenzoic acid , 3,5 dihydroxybenzoic acid , p aminobenzoic acid , anthranilic acid , and p hydroxyphenylacetic acid ,
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL 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