prov:value
| - Exemplary preferred compounds of formula (III) are those in which R5 is a methyl radical, R6 is a hydrogen atom, R7 is a tert-butyl radical, and R8 is a hydroxy radical, namely, 3-t-butyl-2-hydroxy-5- methylbenzylidenecamphor-10-sulfonic acid; or those in which R5 is a methoxy radical, R6 is a hydrogen atom, R7 is a tert-butyl radical, and R8 is a hydroxyl radical, namely, 3-t-butyl-2-hydroxy-5-me
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