| http://www.w3.org/ns/prov#value | - consisting of salicylic acid and its derivatives represented by the formula: ##STR1## wherein each of R1 and R2 is a hydrogen atom or an group, and X is a --COOH group, a --COH=NOH group, a --CONHNH2 group, a --CONH2 group or a --CH=NOH group, salicylic acid derivatives represented by the formula: ##STR2## wherein each of R3 to R5 is a hydrogen atom or an alkyl group, R6 is a hydrogen atom, an alk
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